Floris Geerts

University of Antwerp - Computer Science Department
Building G - Campus Middelheim
Middelheimlaan 1
B-2020 Antwerp, Belgium
+32(0)32653907
floris.geerts@uantwerp.be

I am Professor at the University of Antwerp in the Department of Computer Science where I am part of Adrem Data Lab. In the Adrem Data Lab, I guide research on the principles of data management and graph learning.

We are organizing DBDBD 2025 in Antwerp this year!.

Publications

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2025
•	Towards Bridging Generalization and Expressivity of Graph Neural Networks. Shouheng Li, Dongwoo Kim, Qing Wang, Floris Geerts. Proceedings of 13th International Conference on Learning Representations (ICLR), 2025
•	Covered Forest: Fine-grained generalization analysis of graph neural networks. Antonis Vasileiou, Ben Finkelshtein, Floris Geerts, Ron Levie, Christopher Morris. in ICML, 2025 Spotlight poster
•	Data Management in the Noisy Intermediate-Scale Quantum Era. Rihan Hai, Shih-Han Hung, Tim Coopmans,Floris Geerts. In Proc. End. VLDB, 2025
•	DeepGraphLog for Layered Neurosymbolic AI. Adem Kikaj,Giuseppe Marra,Floris Geerts,Robin Manhaeve, and Luc De Raedt. In Proc. ECAI, 2025
•	From Features to Structure: Task-Aware Graph Construction for Relational and Tabular Learning with GNNs. Tamara Cucumides, Floris Geerts. Third International Workshop on Tabular Data Analysis, 2025
2024
•	A neuro-symbolic framework for answering conjunctive queries. Pablo Barcelo, Tamara Cucumides,Daniel Daza, Floris Geerts,Juan Reutter, Michael Cochez,Miguel Romero. In The Third Learning on Graphs Conference (LOG), 2024 Best Paper Honorable Mention
•	A note on the VC dimension of 1-dimensional GNNs. Noah Daniëls, Floris Geerts. 2024
•	Weisfeiler-Leman at the margin: When more expressivity matters. Billy J. Franks, Christopher Morris, Ameya Velingker,Floris Geerts.In Proceedings of the 41st International Conference on Machine Learning (ICML), 2024
2023
•	The Power of Graph Learning. Floris Geerts. 2023 (YouTube)Richard M. Karp Distinguished Lecture
•	The Expressive Power of Graph Learning. Floris Geerts. 2023 (slides)Invited Tutorial at ACM Summer School on Data Science
•	A Query Language Perspective on Graph Learning. Floris Geerts. In Proceedings of the 42nd ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems (PODS)2023 (slides) Invited Tutorial
•	WL meet VC. Christopher Morris, Floris Geerts, Jan Tönshoff and Martin Grohe. In Proceedings of the 40th International Conference on Machine Learning (ICML), to appear 2023.
2022
•	Ordered Subgraph Aggregation Networks. Chendi Qian, Gaurav Rattan, Floris Geerts, Christopher Morris and Mathias Niepert. In Advances in Neural Information Processing Systems 35: Annual Conference on Neural Information Processing Systems (NeurIPS), to appear, 2022.
•	Expressiveness and Approximation Properties of Graph Neural Networks. Floris Geerts and Juan L. Reutter. In Proceedings of 10th International Conference on Learning Representations (ICLR), OpenReview.net, 2022. Outstanding Paper Award
•	On the expressive power of message-passing neural networks as global feature map transformers. Floris Geerts, Jasper Steegmans and Jan Van den Bussche. In Proceeding of the 12th International Symposium on Foundations of Information and Knowledge Systems (FoIKS), 2022.
2021
•	Graph Neural Networks with Local Graph Parameters. Pablo Barceló, Floris Geerts, Juan L. Reutter and Maksimilian Ryschkov. In Advances in Neural Information Processing Systems 34: Annual Conference on Neural Information Processing Systems (NeurIPS), pp. 25280–25293, 2021.
•	On the Expressive Power of Linear Algebra on Graphs. Floris Geerts. In Theory Comput. Syst., vol. 65, no. 1, pp. 179–239, 2021. Invited - Best of ICDT 2019
•	Let's Agree to Degree: Comparing Graph Convolutional Networks in the Message-Passing Framework. Floris Geerts, Filip Mazowiecki and Guillermo A. Pérez. In Proceedings of the 38th International Conference on Machine Learning (ICLM), PMLR, vol. 139, pp. 3640–3649, 2021.
•	Matrix Query Languages. Floris Geerts, Thomas Muñoz, Cristian Riveros, Jan Van den Bussche and Domagoj Vrgoč. In SIGMOD Rec., vol. 50, no. 3, pp. 6–19, 2021.
•	Expressive Power of Linear Algebra Query Languages. Floris Geerts, Thomas Muñoz, Cristian Riveros and Domagoj Vrgoč. In Proceedings of the 40th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems (PODS), ACM, pp. 342–354, 2021.
2020
•	Data Quality and Explainable AI. Leopoldo E. Bertossi and Floris Geerts. In ACM J. Data Inf. Qual., vol. 12, no. 2, pp. 11:1–11:9, 2020.
•	When Can Matrix Query Languages Discern Matrices?. Floris Geerts. In Proceedings of the 23rd International Conference on Database Theory (ICDT), Schloss Dagstuhl - Leibniz-Zentrum für Informatik, vol. 155, pp. 12:1–12:18, 2020.
•	Walk Message Passing Neural Networks and Second-Order Graph Neural Networks. Floris Geerts. In CoRR, vol. abs/2006.09499, 2020.
•	The expressive power of kth-order invariant graph networks. Floris Geerts. In CoRR, vol. abs/2007.12035, 2020.
•	Cleaning data with Llunatic. Floris Geerts, Giansalvatore Mecca, Paolo Papotti and Donatello Santoro. In VLDB J., vol. 29, no. 4, pp. 867–892, 2020.
•	Cleaning Data with Forbidden Itemsets. Joeri Rammelaere and Floris Geerts. In IEEE Trans. Knowl. Data Eng., vol. 32, no. 8, pp. 1489–1501, 2020.
2019
•	On the Expressive Power of Linear Algebra on Graphs. Floris Geerts. In 22nd International Conference on Database Theory, ICDT 2019, March 26-28, 2019, Lisbon, Portugal, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, vol. 127, pp. 7:1–7:19, 2019.
•	Anytime Approximation in Probabilistic Databases via Scaled Dissociations. Maarten Van den Heuvel, Peter Ivanov, Wolfgang Gatterbauer, Floris Geerts and Martin Theobald. In Proceedings of the 2019 International Conference on Management of Data, SIGMOD Conference 2019, Amsterdam, The Netherlands, June 30 - July 5, 2019, ACM, pp. 1295–1312, 2019.
•	MATLANG: Matrix operations and their expressive power. Robert Brijder, Floris Geerts, Jan Van den Bussche and Timmy Weerwag. In SIGMOD Rec., vol. 48, no. 1, pp. 60–67, 2019.
•	On the Expressive Power of Query Languages for Matrices. Robert Brijder, Floris Geerts, Jan Van den Bussche and Timmy Weerwag. In ACM Trans. Database Syst., vol. 44, no. 4, pp. 15:1–15:31, 2019. Invited - Best of ICDT 2018
2018
•	On the Expressive Power of Query Languages for Matrices. Robert Brijder, Floris Geerts, Jan Van den Bussche and Timmy Weerwag. In 21st International Conference on Database Theory, ICDT 2018, March 26-29, 2018, Vienna, Austria, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, vol. 98, pp. 10:1–10:17, 2018.
•	Revisiting Conditional Functional Dependency Discovery: Splitting the "C" from the "FD". Joeri Rammelaere and Floris Geerts. In Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2018, Dublin, Ireland, September 10-14, 2018, Proceedings, Part II, Springer, vol. 11052, pp. 552–568, 2018.
•	A General Framework for Anytime Approximation in Probabilistic Databases. Maarten Van den Heuvel, Floris Geerts, Wolfgang Gatterbauer and Martin Theobald. In CoRR, vol. abs/1806.10078, 2018.
•	On the expressive power of linear algebra on graphs. Floris Geerts. In CoRR, vol. abs/1812.04379, 2018.
•	Editorial: Special Issue on Improving the Veracity and Value of Big Data. Floris Geerts, Paolo Missier and Norman W. Paton. In ACM J. Data Inf. Qual., vol. 9, no. 3, pp. 13:1–13:2, 2018.
•	Topological elementary equivalence of regular semi-algebraic sets in three-dimensional space. Floris Geerts and Bart Kuijpers. In Math. Log. Q., vol. 64, no. 6, pp. 435–463, 2018.
•	Explaining Repaired Data with CFDs. Joeri Rammelaere and Floris Geerts. In Proc. VLDB Endow., vol. 11, no. 11, pp. 1387–1399, 2018.
•	Bounded Query Rewriting Using Views. Yang Cao, Wenfei Fan, Floris Geerts and Ping Lu. In ACM Trans. Database Syst., vol. 43, no. 1, pp. 6:1–6:46, 2018.
•	Constraint Databases. Floris Geerts. Chapter in Encyclopedia of Database Systems, Second Edition, Springer, 2018.
•	Constraint Query Languages. Floris Geerts. Chapter in Encyclopedia of Database Systems, Second Edition, Springer, 2018.
2017
•	Cleaning Data with Forbidden Itemsets. Joeri Rammelaere, Floris Geerts and Bart Goethals. In 33rd IEEE International Conference on Data Engineering, ICDE 2017, San Diego, CA, USA, April 19-22, 2017, IEEE Computer Society, pp. 897–908, 2017.
•	Proceedings of the 36th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems, PODS 2017, Chicago, IL, USA, May 14-19, 2017 ACM, 2017.
•	On the expressive power of query languages for matrices. Robert Brijder, Floris Geerts, Jan Van den Bussche and Timmy Weerwag. In CoRR, vol. abs/1709.08359, 2017.
•	First-order under-approximations of consistent query answers. Floris Geerts, Fabian Pijcke and Jef Wijsen. In Int. J. Approx. Reason., vol. 83, pp. 337–355, 2017.
•	Database Theory Column Report on PODS 2017. Floris Geerts. In SIGACT News, vol. 48, no. 4, pp. 75–77, 2017.
2016
•	Scale Independence: Using Small Data to Answer Queries on Big Data (Invited Talk). Floris Geerts. In 19th International Conference on Database Theory, ICDT 2016, Bordeaux, France, March 15-18, 2016, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, vol. 48, pp. 2:1–2:2, 2016.
•	Bounded Query Rewriting Using Views. Yang Cao, Wenfei Fan, Floris Geerts and Ping Lu. In Proceedings of the 35th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems, PODS 2016, San Francisco, CA, USA, June 26 - July 01, 2016, ACM, pp. 107–119, 2016.
•	Bounded correlation clustering. Floris Geerts and Reuben Ndindi. In Int. J. Data Sci. Anal., vol. 1, no. 1, pp. 17–35, 2016.
•	Algebraic Structures for Capturing the Provenance of SPARQL Queries. Floris Geerts, Thomas Unger, Grigoris Karvounarakis, Irini Fundulaki and Vassilis Christophides. In J. ACM, vol. 63, no. 1, pp. 7:1–7:63, 2016.
•	Capturing Missing Tuples and Missing Values. Ting Deng, Wenfei Fan and Floris Geerts. In ACM Trans. Database Syst., vol. 41, no. 2, pp. 10:1–10:47, 2016.
2015
•	Space-Bounded Query Approximation. Boris Cule, Floris Geerts and Reuben Ndindi. In Advances in Databases and Information Systems - 19th East European Conference, ADBIS 2015, Poitiers, France, September 8-11, 2015, Proceedings, Springer, vol. 9282, pp. 397–414, 2015.
•	Proceedings of the 18th International Conference on Extending Database Technology, EDBT 2015, Brussels, Belgium, March 23-27, 2015 OpenProceedings.org, 2015.
•	Proceedings of the Workshops of the EDBT/ICDT 2015 Joint Conference (EDBT/ICDT), Brussels, Belgium, March 27th, 2015 CEUR-WS.org, vol. 1330, 2015.
•	Querying Big Data by Accessing Small Data. Wenfei Fan, Floris Geerts, Yang Cao, Ting Deng and Ping Lu. In Proceedings of the 34th ACM Symposium on Principles of Database Systems, PODS 2015, Melbourne, Victoria, Australia, May 31 - June 4, 2015, ACM, pp. 173–184, 2015.
•	First-Order Under-Approximations of Consistent Query Answers. Floris Geerts, Fabian Pijcke and Jef Wijsen. In Scalable Uncertainty Management - 9th International Conference, SUM 2015, Québec City, QC, Canada, September 16-18, 2015. Proceedings, Springer, vol. 9310, pp. 354–367, 2015.
•	Cell-based Causality for Data Repairs. Maxime Debosschere and Floris Geerts. In 7th USENIX Workshop on the Theory and Practice of Provenance, TaPP 2015, Edinburgh, Scotland, UK, July 8-9, 2015, USENIX Association, 2015.
•	On recommendation problems beyond points of interest. Ting Deng, Wenfei Fan and Floris Geerts. In Inf. Syst., vol. 48, pp. 64–88, 2015.
2014
•	Interactive correlation clustering. Floris Geerts and Reuben Ndindi. In International Conference on Data Science and Advanced Analytics, DSAA 2014, Shanghai, China, October 30 - November 1, 2014, IEEE, pp. 170–176, 2014.
•	Mapping and cleaning. Floris Geerts, Giansalvatore Mecca, Paolo Papotti and Donatello Santoro. In IEEE 30th International Conference on Data Engineering, Chicago, ICDE 2014, IL, USA, March 31 - April 4, 2014, IEEE Computer Society, pp. 232–243, 2014.
•	On scale independence for querying big data. Wenfei Fan, Floris Geerts and Leonid Libkin. In Proceedings of the 33rd ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS'14, Snowbird, UT, USA, June 22-27, 2014, ACM, pp. 51–62, 2014.
•	An Overview of the Llunatic System. Floris Geerts, Giansalvatore Mecca, Paolo Papotti and Donatello Santoro. In 22nd Italian Symposium on Advanced Database Systems, SEBD 2014, Sorrento Coast, Italy, June 16-18, 2014, pp. 159–166, 2014.
•	Detecting Errors in Numeric Attributes. Grace Fan, Wenfei Fan and Floris Geerts. In Web-Age Information Management - 15th International Conference, WAIM 2014, Macau, China, June 16-18, 2014. Proceedings, Springer, vol. 8485, pp. 125–137, 2014.
•	On the data complexity of relative information completeness. Yang Cao, Ting Deng, Wenfei Fan and Floris Geerts. In Inf. Syst., vol. 45, pp. 18–34, 2014.
•	Conflict resolution with data currency and consistency. Wenfei Fan, Floris Geerts, Nan Tang and Wenyuan Yu. In ACM J. Data Inf. Qual., vol. 5, no. 1-2, pp. 6:1–6:37, 2014.
•	That's All Folks! LLUNATIC Goes Open Source. Floris Geerts, Giansalvatore Mecca, Paolo Papotti and Donatello Santoro. In Proc. VLDB Endow., vol. 7, no. 13, pp. 1565–1568, 2014.
2013
•	Data Quality Problems beyond Consistency and Deduplication. Wenfei Fan, Floris Geerts, Shuai Ma, Nan Tang and Wenyuan Yu. In In Search of Elegance in the Theory and Practice of Computation - Essays Dedicated to Peter Buneman, Springer, vol. 8000, pp. 237–249, 2013.
•	Looking at the World Thru Colored Glasses. Floris Geerts and Anastasios Kementsietsidis. In In Search of Elegance in the Theory and Practice of Computation - Essays Dedicated to Peter Buneman, Springer, vol. 8000, pp. 259–272, 2013.
•	Inferring data currency and consistency for conflict resolution. Wenfei Fan, Floris Geerts, Nan Tang and Wenyuan Yu. In 29th IEEE International Conference on Data Engineering, ICDE 2013, Brisbane, Australia, April 8-12, 2013, IEEE Computer Society, pp. 470–481, 2013.
•	Algebraic structures for capturing the provenance of SPARQL queries. Floris Geerts, Grigoris Karvounarakis, Vassilis Christophides and Irini Fundulaki. In Joint 2013 EDBT/ICDT Conferences, ICDT '13 Proceedings, Genoa, Italy, March 18-22, 2013, ACM, pp. 153–164, 2013.
•	Generating, Sampling and Counting Subclasses of Regular Tree Languages. Timos Antonopoulos, Floris Geerts, Wim Martens and Frank Neven. In Theory Comput. Syst., vol. 52, no. 3, pp. 542–585, 2013.
•	Making Queries Tractable on Big Data with Preprocessing. Wenfei Fan, Floris Geerts and Frank Neven. In Proc. VLDB Endow., vol. 6, no. 9, pp. 685–696, 2013.
•	The LLUNATIC Data-Cleaning Framework. Floris Geerts, Giansalvatore Mecca, Paolo Papotti and Donatello Santoro. In Proc. VLDB Endow., vol. 6, no. 9, pp. 625–636, 2013.
•	On the Complexity of Package Recommendation Problems. Ting Deng, Wenfei Fan and Floris Geerts. In SIAM J. Comput., vol. 42, no. 5, pp. 1940–1986, 2013.
2012
•	On the complexity of package recommendation problems. Ting Deng, Wenfei Fan and Floris Geerts. In Proceedings of the 31st ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2012, Scottsdale, AZ, USA, May 20-24, 2012, ACM, pp. 261–272, 2012.
•	View determinacy for preserving selected information in data transformations. Wenfei Fan, Floris Geerts and Lixiao Zheng. In Inf. Syst., vol. 37, no. 1, pp. 1–12, 2012.
•	On the Complexity of View Update Analysis and Its Application to Annotation Propagation. Gao Cong, Wenfei Fan, Floris Geerts, Jianzhong Li and Jizhou Luo. In IEEE Trans. Knowl. Data Eng., vol. 24, no. 3, pp. 506–519, 2012.
•	Determining the Currency of Data. Wenfei Fan, Floris Geerts and Jef Wijsen. In ACM Trans. Database Syst., vol. 37, no. 4, pp. 25:1–25:46, 2012.
•	Foundations of Data Quality Management. Wenfei Fan and Floris Geerts. Morgan & Claypool Publishers, 2012.
2011
•	Generating, sampling and counting subclasses of regular tree languages. Timos Antonopoulos, Floris Geerts, Wim Martens and Frank Neven. In Database Theory - ICDT 2011, 14th International Conference, Uppsala, Sweden, March 21-24, 2011, Proceedings, ACM, pp. 30–41, 2011.
•	Determining the currency of data. Wenfei Fan, Floris Geerts and Jef Wijsen. In Proceedings of the 30th ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2011, June 12-16, 2011, Athens, Greece, ACM, pp. 71–82, 2011.
•	Uniform Dependency Language for Improving Data Quality. Wenfei Fan and Floris Geerts. In IEEE Data Eng. Bull., vol. 34, no. 3, pp. 34–42, 2011.
•	Relational completeness of query languages for annotated databases. Floris Geerts and Jan Van den Bussche. In J. Comput. Syst. Sci., vol. 77, no. 3, pp. 491–504, 2011.
•	Foreword. Albert Atserias, Mikolaj Bojanczyk, Balder ten Cate, Ronald Fagin, Floris Geerts and Kenneth A. Ross. In Theory Comput. Syst., vol. 49, no. 2, pp. 365–366, 2011.
•	Discovering Conditional Functional Dependencies. Wenfei Fan, Floris Geerts, Jianzhong Li and Ming Xiong. In IEEE Trans. Knowl. Data Eng., vol. 23, no. 5, pp. 683–698, 2011.
2010
•	Detecting inconsistencies in distributed data. Wenfei Fan, Floris Geerts and Shuai Ma. In Proceedings of the 26th International Conference on Data Engineering, ICDE 2010, March 1-6, 2010, Long Beach, California, USA, IEEE Computer Society, pp. 64–75, 2010.
•	Static analysis of schema-mappings ensuring oblivious termination. Bruno Marnette and Floris Geerts. In Database Theory - ICDT 2010, 13th International Conference, Lausanne, Switzerland, March 23-25, 2010, Proceedings, ACM, pp. 183–195, 2010.
•	Capturing missing tuples and missing values. Wenfei Fan and Floris Geerts. In Proceedings of the Twenty-Ninth ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2010, June 6-11, 2010, Indianapolis, Indiana, USA, ACM, pp. 169–178, 2010.
•	On database query languages for K-relations. Floris Geerts and Antonella Poggi. In J. Appl. Log., vol. 8, no. 2, pp. 173–185, 2010.
•	Relative information completeness. Wenfei Fan and Floris Geerts. In ACM Trans. Database Syst., vol. 35, no. 4, pp. 27:1–27:44, 2010.
2009
•	Conditional Dependencies: A Principled Approach to Improving Data Quality. Wenfei Fan, Floris Geerts and Xibei Jia. In Dataspace: The Final Frontier, 26th British National Conference on Databases, BNCOD 26, Birmingham, UK, July 7-9, 2009. Proceedings, Springer, vol. 5588, pp. 8–20, 2009.
•	Database Programming Languages - DBPL 2009, 12th International Symposium, Lyon, France, August 24, 2009. Proceedings Springer, vol. 5708, 2009.
•	Discovering Conditional Functional Dependencies. Wenfei Fan, Floris Geerts, Laks V. S. Lakshmanan and Ming Xiong. In Proceedings of the 25th International Conference on Data Engineering, ICDE 2009, March 29 2009 - April 2 2009, Shanghai, China, IEEE Computer Society, pp. 1231–1234, 2009.
•	Relative information completeness. Wenfei Fan and Floris Geerts. In Proceedings of the Twenty-Eigth ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2009, June 19 - July 1, 2009, Providence, Rhode Island, USA, ACM, pp. 97–106, 2009.
•	Constraint Databases. Floris Geerts. Chapter in Encyclopedia of Database Systems, Springer US, pp. 452–453, 2009.
•	Constraint Query Languages. Floris Geerts. Chapter in Encyclopedia of Database Systems, Springer US, pp. 454–458, 2009.
2008
•	Increasing the Expressivity of Conditional Functional Dependencies without Extra Complexity. Loreto Bravo, Wenfei Fan, Floris Geerts and Shuai Ma. In Proceedings of the 24th International Conference on Data Engineering, ICDE 2008, April 7-12, 2008, Cancún, Mexico, IEEE Computer Society, pp. 516–525, 2008.
•	Complexity and composition of synthesized web services. Wenfei Fan, Floris Geerts, Wouter Gelade, Frank Neven and Antonella Poggi. In Proceedings of the Twenty-Seventh ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2008, June 9-11, 2008, Vancouver, BC, Canada, ACM, pp. 231–240, 2008.
•	XPath satisfiability in the presence of DTDs. Michael Benedikt, Wenfei Fan and Floris Geerts. In J. ACM, vol. 55, no. 2, pp. 8:1–8:79, 2008.
•	Semandaq: a data quality system based on conditional functional dependencies. Wenfei Fan, Floris Geerts and Xibei Jia. In Proc. VLDB Endow., vol. 1, no. 2, pp. 1460–1463, 2008.
•	A revival of integrity constraints for data cleaning. Wenfei Fan, Floris Geerts and Xibei Jia. In Proc. VLDB Endow., vol. 1, no. 2, pp. 1522–1523, 2008.
•	First-order complete and computationally complete query languages for spatio-temporal databases. Floris Geerts, Sofie Haesevoets and Bart Kuijpers. In ACM Trans. Comput. Log., vol. 9, no. 2, pp. 13:1–13:51, 2008.
•	Conditional functional dependencies for capturing data inconsistencies. Wenfei Fan, Floris Geerts, Xibei Jia and Anastasios Kementsietsidis. In ACM Trans. Database Syst., vol. 33, no. 2, pp. 6:1–6:48, 2008.
•	Expressiveness and complexity of XML publishing transducers. Wenfei Fan, Floris Geerts and Frank Neven. In ACM Trans. Database Syst., vol. 33, no. 4, pp. 25:1–25:49, 2008.
2007
•	Relational Completeness of Query Languages for Annotated Databases. Floris Geerts and Jan Van den Bussche. In Database Programming Languages, 11th International Symposium, DBPL 2007, Vienna, Austria, September 23-24, 2007, Revised Selected Papers, Springer, vol. 4797, pp. 127–137, 2007.
•	Conditional Functional Dependencies for Data Cleaning. Philip Bohannon, Wenfei Fan, Floris Geerts, Xibei Jia and Anastasios Kementsietsidis. In Proceedings of the 23rd International Conference on Data Engineering, ICDE 2007, The Marmara Hotel, Istanbul, Turkey, April 15-20, 2007, IEEE Computer Society, pp. 746–755, 2007.
•	Rewriting Regular XPath Queries on XML Views. Wenfei Fan, Floris Geerts, Xibei Jia and Anastasios Kementsietsidis. In Proceedings of the 23rd International Conference on Data Engineering, ICDE 2007, The Marmara Hotel, Istanbul, Turkey, April 15-20, 2007, IEEE Computer Society, pp. 666–675, 2007.
•	Expressiveness and complexity of xml publishing transducers. Wenfei Fan, Floris Geerts and Frank Neven. In Proceedings of the Twenty-Sixth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 11-13, 2007, Beijing, China, ACM, pp. 83–92, 2007.
•	Improving Data Quality: Consistency and Accuracy. Gao Cong, Wenfei Fan, Floris Geerts, Xibei Jia and Shuai Ma. In Proceedings of the 33rd International Conference on Very Large Data Bases, University of Vienna, Austria, September 23-27, 2007, ACM, pp. 315–326, 2007.
•	Real Algebraic Geometry and Constraint Databases. Floris Geerts and Bart Kuijpers. Chapter in Handbook of Spatial Logics, Springer, pp. 799–856, 2007.
2006
•	Annotation propagation revisited for key preserving views. Gao Cong, Wenfei Fan and Floris Geerts. In Proceedings of the 2006 ACM CIKM International Conference on Information and Knowledge Management, Arlington, Virginia, USA, November 6-11, 2006, ACM, pp. 632–641, 2006.
•	\emphiMONDRIAN: A Visual Tool to Annotate and Query Scientific Databases. Floris Geerts, Anastasios Kementsietsidis and Diego Milano. In Advances in Database Technology - EDBT 2006, 10th International Conference on Extending Database Technology, Munich, Germany, March 26-31, 2006, Proceedings, Springer, vol. 3896, pp. 1168–1171, 2006.
•	On-line maintenance of simplified weighted graphs for efficient distance queries. Floris Geerts, Peter Z. Revesz and Jan Van den Bussche. In 14th ACM International Symposium on Geographic Information Systems, ACM-GIS 2006, November 10-11, 2006, Arlington, Virginia, USA, Proceedings, ACM, pp. 203–210, 2006.
•	MONDRIAN: Annotating and Querying Databases through Colors and Blocks. Floris Geerts, Anastasios Kementsietsidis and Diego Milano. In Proceedings of the 22nd International Conference on Data Engineering, ICDE 2006, 3-8 April 2006, Atlanta, GA, USA, IEEE Computer Society, pp. 82, 2006.
•	SMOQE: A System for Providing Secure Access to XML. Wenfei Fan, Floris Geerts, Xibei Jia and Anastasios Kementsietsidis. In Proceedings of the 32nd International Conference on Very Large Data Bases, Seoul, Korea, September 12-15, 2006, ACM, pp. 1227–1230, 2006.
•	HaploRec: efficient and accurate large-scale reconstruction of haplotypes. Lauri Eronen, Floris Geerts and Hannu Toivonen. In BMC Bioinform., vol. 7, pp. 542, 2006.
•	On-line topological simplification of weighted graphs. Floris Geerts, Peter Z. Revesz and Jan Van den Bussche. In CoRR, vol. abs/cs/0608091, 2006.
•	Linearization and Completeness Results for Terminating Transitive Closure Queries on Spatial Databases. Floris Geerts, Bart Kuijpers and Jan Van den Bussche. In SIAM J. Comput., vol. 35, no. 6, pp. 1386–1439, 2006.
2005
•	Satisfiability of XPath Queries with Sibling Axes. Floris Geerts and Wenfei Fan. In Database Programming Languages, 10th International Symposium, DBPL 2005, Trondheim, Norway, August 28-29, 2005, Revised Selected Papers, Springer, vol. 3774, pp. 122–137, 2005.
•	XPath satisfiability in the presence of DTDs. Michael Benedikt, Wenfei Fan and Floris Geerts. In Proceedings of the Twenty-fourth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 13-15, 2005, Baltimore, Maryland, USA, ACM, pp. 25–36, 2005.
•	N-dimensional versus (N-1)-dimensional connectivity testing of first-order queries to semi-algebraic sets. Floris Geerts, Lieven Smits and Jan Van den Bussche. In Acta Informatica, vol. 42, no. 1, pp. 43–56, 2005.
•	First-order Complete and Computationally Complete Query Languages for Spatio-Temporal Databases. Floris Geerts, Sofie Haesevoets and Bart Kuijpers. In CoRR, vol. abs/cs/0503012, 2005.
•	On the decidability of termination of query evaluation in transitive-closure logics for polynomial constraint databases. Floris Geerts and Bart Kuijpers. In Theor. Comput. Sci., vol. 336, no. 1, pp. 125–151, 2005.
•	Tight upper bounds on the number of candidate patterns. Floris Geerts, Bart Goethals and Jan Van den Bussche. In ACM Trans. Database Syst., vol. 30, no. 2, pp. 333–363, 2005.
2004
•	Moving Objects and Their Equations of Motion. Floris Geerts. In Constraint Databases, Proceedings of the 1st International Symposium on Applications of Constraint Databases, CDB'04, Paris, France, June 12-13, 2004, Springer, vol. 3074, pp. 41–52, 2004.
•	Tiling Databases. Floris Geerts and Bart Goethals. In Discovery Science, 7th International Conference, DS 2004, Padova, Italy, October 2-5, 2004, Proceedings, Springer, vol. 3245, pp. 278–289, 2004.
•	A Markov Chain Approach to Reconstruction of Long Haplotypes. Lauri Eronen, Floris Geerts and Hannu Toivonen. In Biocomputing 2004, Proceedings of the Pacific Symposium, Hawaii, USA, 6-10 January 2004, World Scientific, pp. 104–115, 2004.
•	Relational link-based ranking. Floris Geerts, Heikki Mannila and Evimaria Terzi. In (e)Proceedings of the Thirtieth International Conference on Very Large Data Bases, VLDB 2004, Toronto, Canada, August 31 - September 3 2004, Morgan Kaufmann, pp. 552–563, 2004.
•	Frequent Knot Discovery. Floris Geerts. In CoRR, vol. cs.DB/0410038, 2004.
•	Topological formulation of termination properties of iterates of functions. Floris Geerts and Bart Kuijpers. In Inf. Process. Lett., vol. 89, no. 1, pp. 31–35, 2004.
2003
•	Deciding Termination of Query Evaluation in Transitive-Closure Logics for Constraint Databases. Floris Geerts and Bart Kuijpers. In Database Theory - ICDT 2003, 9th International Conference, Siena, Italy, January 8-10, 2003, Proceedings, Springer, vol. 2572, pp. 190–206, 2003.
•	What You Store is What You Get. Floris Geerts and Bart Goethals. In Proceedings of the Second International Workshop on Inductive Databases, 22 September, Cavtat-Dubrovnik, Croatia, Rudjer Boskovic Institute, Zagreb, Croatia, pp. 60–69, 2003.
•	Two- versus three-dimensional connectivity testing of first-order queries to semi-algebraic sets. Floris Geerts, Lieven Smits and Jan Van den Bussche. In CoRR, vol. cs.LO/0308001, 2003.
•	Expressing the box cone radius in the relational calculus with real polynomial constraints. Floris Geerts. In Discret. Comput. Geom., vol. 30, no. 4, pp. 607–622, 2003.
2001
•	Linear Approximation of Semi-algebraic Spatial Databases Using Transitive Closure Logic, in Arbitrary Dimension. Floris Geerts. In Database Programming Languages, 8th International Workshop, DBPL 2001, Frascati, Italy, September 8-10, 2001, Revised Papers, Springer, vol. 2397, pp. 182–197, 2001.
•	A Theory of Spatio-Temporal Database Queries. Floris Geerts, Sofie Haesevoets and Bart Kuijpers. In Database Programming Languages, 8th International Workshop, DBPL 2001, Frascati, Italy, September 8-10, 2001, Revised Papers, Springer, vol. 2397, pp. 198–212, 2001.
•	A Tight Upper Bound on the Number of Candidate Patterns. Floris Geerts, Bart Goethals and Jan Van den Bussche. In Proceedings of the 2001 IEEE International Conference on Data Mining, 29 November - 2 December 2001, San Jose, California, USA, IEEE Computer Society, pp. 155–162, 2001.
•	Expressing the cone radius in the relational calculus with real polynomial constraints. Floris Geerts. In CoRR, vol. cs.DB/0106046, 2001.
•	A Tight Upper Bound on the Number of Candidate Patterns. Floris Geerts, Bart Goethals and Jan Van den Bussche. In CoRR, vol. cs.DB/0112007, 2001.
2000
•	Linear Approximation of Planar Spatial Databases Using Transitive-Closure Logic. Floris Geerts and Bart Kuijpers. In Proceedings of the Nineteenth ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, May 15-17, 2000, Dallas, Texas, USA, ACM, pp. 126–135, 2000.
1999
•	Expressing Topological Connectivity of Spatial Databases. Floris Geerts and Bart Kuijpers. In Research Issues in Structured and Semistructured Database Programming. Proceedings of the 7th International Workshop on Database Programming Languages (DBPL), Springer, vol. 1949, pp. 224–238, 1999.
1998
•	Superposition of Markov sources and long range dependence. Floris Geerts and Chris Blondia. In Broadband Communications: The future of telecommunications. Proceedings of the 4th International Conference on Broadband Communications (BC '98), Chapman & Hall, vol. 121, pp. 550–562, 1998.
•	Topological Canonization of Planar Spatial Data and Its Incremental Maintenance. Floris Geerts, Bart Kuijpers and Jan Van den Bussche. In Fundamentals of Information Systems - Papers from the 7th Workshop on Foundations of Models and Languages for Data and Objects (FoMLaDO), Kluwer, pp. 55–67, 1998.
1997
•	The Correlation Structure of the Output of an ATM Multiplexer. Chris Blondia and Floris Geerts. In Performance Analysis of ATM Networks. Proceedings of the 5th International Workshop on Performance Modelling and Evaluation of ATM Networks, Kluwer, vol. 157, pp. 235–250, 1997.