publications

2026

1. KDD

   Enforcing Trust Accountability with Backward Propagation

   Wenbo Wu and George Konstantinidis

   In Proceedings of the 32nd ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD 2026), 2026

   To appear

   Bib

   @inproceedings{wu2026trust,
     title = {Enforcing Trust Accountability with Backward Propagation},
     author = {Wu, Wenbo and Konstantinidis, George},
     booktitle = {Proceedings of the 32nd ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD 2026)},
     year = {2026},
     note = {To appear},
   }

2. SIGMOD

   A Game Theory Approach for Negotiating in Data Marketplaces

   Soulmaz Gheisari, Jaime Osvaldo Salas, Luis-Daniel Ibáñez, and 1 more author

   Proceedings of the ACM on Management of Data, Apr 2026

   DOI Bib HTML

   @article{gheisari2026game,
     title = {A Game Theory Approach for Negotiating in Data Marketplaces},
     author = {Gheisari, Soulmaz and Salas, Jaime Osvaldo and Ibáñez, Luis-Daniel and Konstantinidis, George},
     journal = {Proceedings of the ACM on Management of Data},
     volume = {4},
     number = {1},
     pages = {1--27},
     year = {2026},
     month = apr,
     doi = {10.1145/3786616},
   }

3. FC

   Compliance as a Trust Metric

   Wenbo Wu and George Konstantinidis

   In Financial Cryptography and Data Security (FC 2026), 2026

   To appear

   arXiv Bib

   @inproceedings{wu2026compliance,
     title = {Compliance as a Trust Metric},
     author = {Wu, Wenbo and Konstantinidis, George},
     booktitle = {Financial Cryptography and Data Security (FC 2026)},
     year = {2026},
     note = {To appear}
   }

2025

1. ICDT

   Bag Containment of Join-on-Free Queries

   George Konstantinidis and Fabio Mogavero

   In Proceedings of the 28th International Conference on Database Theory (ICDT 2025), 2025

   DOI Bib PDF

   @inproceedings{konstantinidis2025bag,
     title = {Bag Containment of Join-on-Free Queries},
     author = {Konstantinidis, George and Mogavero, Fabio},
     booktitle = {Proceedings of the 28th International Conference on Database Theory (ICDT 2025)},
     series = {LIPIcs},
     volume = {328},
     year = {2025},
     doi = {10.4230/LIPIcs.ICDT.2025.5},
   }

2024

1. ISWC

   Data Sharing Negotiation and Contracting

   Semih Yumusak, S. Gheisari, J. O. Salas, and 3 more authors

   In Proceedings of the 23rd International Semantic Web Conference (ISWC 2024), 2024

   Bib HTML

   @inproceedings{yumusak2024negotiation,
     title = {Data Sharing Negotiation and Contracting},
     author = {Yumusak, Semih and Gheisari, S. and Salas, J. O. and Moqurrab, Syed Atif and Ibáñez, Luis-Daniel and Konstantinidis, George},
     booktitle = {Proceedings of the 23rd International Semantic Web Conference (ISWC 2024)},
     year = {2024},
   }

2. RuleML+RR

   Towards Modular Data Marketplaces

   S. Gheisari, Semih Yumusak, J. O. Salas, and 3 more authors

   In RuleML+RR’24: Companion Proceedings of the 8th International Joint Conference on Rules and Reasoning, 2024

   Bib PDF

   @inproceedings{gheisari2024modular,
     title = {Towards Modular Data Marketplaces},
     author = {Gheisari, S. and Yumusak, Semih and Salas, J. O. and Ibáñez, Luis-Daniel and Konstantinidis, George and Roman, Dumitru},
     booktitle = {RuleML+RR'24: Companion Proceedings of the 8th International Joint Conference on Rules and Reasoning},
     year = {2024},
   }

3. SIGMOD Rec.

   Graph Theory for Consent Management: A New Approach for Complex Data Flows

   Dorota Filipczuk, Enrico H. Gerding, and George Konstantinidis

   ACM SIGMOD Record, 2024

   DOI Bib HTML

   @article{filipczuk2024graph,
     title = {Graph Theory for Consent Management: A New Approach for Complex Data Flows},
     author = {Filipczuk, Dorota and Gerding, Enrico H. and Konstantinidis, George},
     journal = {ACM SIGMOD Record},
     volume = {53},
     number = {1},
     pages = {55--63},
     year = {2024},
     doi = {10.1145/3665252.3665265},
   }

2023

1. EDBT

   Consent Management in Data Workflows: A Graph Problem

   Dorota Filipczuk, Enrico H. Gerding, and George Konstantinidis

   In Proceedings of the 26th International Conference on Extending Database Technology (EDBT 2023), 2023

   SIGMOD Research Highlight Bib PDF

   Received the 2024 ACM SIGMOD Research Highlights Award

   @inproceedings{filipczuk2023consent,
     title = {Consent Management in Data Workflows: A Graph Problem},
     author = {Filipczuk, Dorota and Gerding, Enrico H. and Konstantinidis, George},
     booktitle = {Proceedings of the 26th International Conference on Extending Database Technology (EDBT 2023)},
     year = {2023},
   }

2. ESWC

   Selling Decentralized Knowledge Graphs

   Luis-Daniel Ibáñez and George Konstantinidis

   In Trusting Decentralised Knowledge Graphs and Web Data Workshop at the 20th Extended Semantic Web Conference (ESWC 2023), 2023

   Bib PDF

   @inproceedings{ibanez2023selling,
     title = {Selling Decentralized Knowledge Graphs},
     author = {Ibáñez, Luis-Daniel and Konstantinidis, George},
     booktitle = {Trusting Decentralised Knowledge Graphs and Web Data Workshop at the 20th Extended Semantic Web Conference (ESWC 2023)},
     address = {Hersonissos, Greece},
     year = {2023},
   }

3. SAIDD

   Data Marketplaces in the AI Economy

   George Konstantinidis, Luis-Daniel Ibáñez, and Dumitru Roman

   In Symposium on AI, Data and Digitalization (SAIDD 2023), 2023

   Bib PDF

   @inproceedings{konstantinidis2023marketplaces,
     title = {Data Marketplaces in the AI Economy},
     author = {Konstantinidis, George and Ibáñez, Luis-Daniel and Roman, Dumitru},
     booktitle = {Symposium on AI, Data and Digitalization (SAIDD 2023)},
     year = {2023},
   }

4. ISWC

   ForBackBench: From Database to Semantic Web Mappings and Back

   A. G. Alhazmi, J. S. Trejo, and George Konstantinidis

   In Proceedings of the 22nd International Semantic Web Conference (ISWC 2023), 2023

   Bib PDF

   @inproceedings{alhazmi2023forbackbench,
     title = {ForBackBench: From Database to Semantic Web Mappings and Back},
     author = {Alhazmi, A. G. and Trejo, J. S. and Konstantinidis, George},
     booktitle = {Proceedings of the 22nd International Semantic Web Conference (ISWC 2023)},
     year = {2023},
   }

5. WISE

   A Dual-Layer Privacy-Preserving Federated Learning Framework

   W. Huang, Thanassis Tiropanis, and George Konstantinidis

   In Web Information Systems Engineering – WISE 2023, Lecture Notes in Computer Science, vol. 14306, 2023

   DOI Bib

   @inproceedings{huang2023duallayer,
     title = {A Dual-Layer Privacy-Preserving Federated Learning Framework},
     author = {Huang, W. and Tiropanis, Thanassis and Konstantinidis, George},
     booktitle = {Web Information Systems Engineering -- WISE 2023, Lecture Notes in Computer Science, vol. 14306},
     publisher = {Springer, Singapore},
     year = {2023},
     doi = {10.1007/978-981-99-7254-8_19}
   }

2022

1. JWS

   Satisfiability and Containment of Recursive SHACL

   Paolo Pareti, George Konstantinidis, and Fabio Mogavero

   Journal of Web Semantics, 2022

   DOI Bib HTML

   @article{pareti2022satisfiability,
     title = {Satisfiability and Containment of Recursive SHACL},
     author = {Pareti, Paolo and Konstantinidis, George and Mogavero, Fabio},
     journal = {Journal of Web Semantics},
     volume = {74},
     pages = {100721},
     year = {2022},
     doi = {10.1016/j.websem.2022.100721},
   }

2. PVLDB

   ForBackBench: A Benchmark for Chasing vs. Query Rewriting

   Afnan Alhazmi, Tom Blount, and George Konstantinidis

   Proceedings of the VLDB Endowment, 2022

   DOI Bib HTML

   @article{alhazmi2022forbackbench,
     title = {ForBackBench: A Benchmark for Chasing vs. Query Rewriting},
     author = {Alhazmi, Afnan and Blount, Tom and Konstantinidis, George},
     journal = {Proceedings of the VLDB Endowment},
     volume = {15},
     number = {8},
     pages = {1519--1532},
     year = {2022},
     doi = {10.14778/3529337.3529338},
   }

3. ISWC

   OBDA vs Forward Chaining: The ForBackBench Framework

   Afnan Alhazmi and George Konstantinidis

   In Proceedings of the 21st International Semantic Web Conference (ISWC 2022), 2022

   Best Demo Award Bib HTML

   Best Demo Award

   @inproceedings{alhazmi2022obda,
     title = {OBDA vs Forward Chaining: The ForBackBench Framework},
     author = {Alhazmi, Afnan and Konstantinidis, George},
     booktitle = {Proceedings of the 21st International Semantic Web Conference (ISWC 2022)},
     year = {2022},
   }

4. GIoTS

   Federated Learning-Based IoT Intrusion Detection on Non-IID Data

   W. Huang, Thanassis Tiropanis, and George Konstantinidis

   In Global Internet of Things Summit (GIoTS 2022), Lecture Notes in Computer Science, 2022

   DOI Bib

   @inproceedings{huang2022federated,
     title = {Federated Learning-Based IoT Intrusion Detection on Non-IID Data},
     author = {Huang, W. and Tiropanis, Thanassis and Konstantinidis, George},
     booktitle = {Global Internet of Things Summit (GIoTS 2022), Lecture Notes in Computer Science},
     publisher = {Springer},
     year = {2022},
     doi = {10.1007/978-3-031-20936-9_26}
   }

5. RW

   A Review of SHACL: From Data Validation to Schema Reasoning for RDF Graphs

   Paolo Pareti and George Konstantinidis

   In Reasoning Web International Summer School, 2022

   DOI Bib

   @inproceedings{pareti2022review,
     title = {A Review of SHACL: From Data Validation to Schema Reasoning for RDF Graphs},
     author = {Pareti, Paolo and Konstantinidis, George},
     booktitle = {Reasoning Web International Summer School},
     pages = {115--144},
     publisher = {Springer},
     year = {2022},
     doi = {10.1007/978-3-030-95481-9_6}
   }

2021

1. PVLDB

   Enabling Personal Consent in Databases

   George Konstantinidis, Jet Holt, and Adriane Chapman

   Proceedings of the VLDB Endowment, 2021

   DOI Bib PDF

   @article{konstantinidis2021consent,
     title = {Enabling Personal Consent in Databases},
     author = {Konstantinidis, George and Holt, Jet and Chapman, Adriane},
     journal = {Proceedings of the VLDB Endowment},
     volume = {15},
     number = {2},
     pages = {375--387},
     year = {2021},
     doi = {10.14778/3489496.3489516},
   }

2. WebSci

   Social Science for Natural Language Processing: A Hostile Narrative Analysis Prototype

   Stephen Anning, George Konstantinidis, and Craig Webber

   In Proceedings of the 13th ACM Web Science Conference (WebSci 2021), 2021

   Honourable Mention DOI Bib

   Honourable mention paper

   @inproceedings{anning2021social,
     title = {Social Science for Natural Language Processing: A Hostile Narrative Analysis Prototype},
     author = {Anning, Stephen and Konstantinidis, George and Webber, Craig},
     booktitle = {Proceedings of the 13th ACM Web Science Conference (WebSci 2021)},
     pages = {102--111},
     year = {2021},
     doi = {10.1145/3447535.3462489},
   }

2020

1. Algorithms

   The Need for Machine-Processable Agreements in Health Data Management

   George Konstantinidis, Adriane Chapman, Mark J. Weal, and 3 more authors

   Algorithms, 2020

   DOI Bib HTML

   @article{konstantinidis2020need,
     title = {The Need for Machine-Processable Agreements in Health Data Management},
     author = {Konstantinidis, George and Chapman, Adriane and Weal, Mark J. and Alzubaidi, A. and Ballard, Lisa M. and Lucassen, Anneke M.},
     journal = {Algorithms},
     volume = {13},
     number = {4},
     pages = {87},
     year = {2020},
     doi = {10.3390/a13040087},
   }

2. VLDBJ

   Dataset Search: A Survey

   Adriane Chapman, Elena Simperl, Laura Koesten, and 4 more authors

   The VLDB Journal, 2020

   DOI Bib HTML

   @article{chapman2020dataset,
     title = {Dataset Search: A Survey},
     author = {Chapman, Adriane and Simperl, Elena and Koesten, Laura and Konstantinidis, George and Ibáñez-González, Luis-Daniel and Kacprzak, Emilia and Groth, Paul},
     journal = {The VLDB Journal},
     volume = {29},
     number = {1},
     pages = {215--272},
     year = {2020},
     doi = {10.1007/s00778-019-00564-x},
   }

3. ISWC

   SHACL Satisfiability and Containment

   Paolo Pareti, George Konstantinidis, Fabio Mogavero, and 1 more author

   In Proceedings of the 19th International Semantic Web Conference (ISWC 2020), 2020

   DOI Bib

   @inproceedings{pareti2020shacl,
     title = {SHACL Satisfiability and Containment},
     author = {Pareti, Paolo and Konstantinidis, George and Mogavero, Fabio and Norman, Timothy J.},
     booktitle = {Proceedings of the 19th International Semantic Web Conference (ISWC 2020)},
     pages = {474--493},
     publisher = {Springer, Cham},
     year = {2020},
     doi = {10.1007/978-3-030-62419-4_27}
   }

4. IJCAI

   Rule Applicability on RDF Triplestore Schemas

   Paolo Pareti, George Konstantinidis, Timothy J. Norman, and 1 more author

   In Workshop on AI for Internet of Things at IJCAI-PRICAI 2020, 2020

   Bib HTML

   @inproceedings{pareti2020rule,
     title = {Rule Applicability on RDF Triplestore Schemas},
     author = {Pareti, Paolo and Konstantinidis, George and Norman, Timothy J. and Şensoy, Murat},
     booktitle = {Workshop on AI for Internet of Things at IJCAI-PRICAI 2020},
     address = {Yokohama, Japan},
     year = {2020},
   }

5. WebSci

   The Secret Life of Immortal Data

   Kate Lyle, Anneke Lucassen, Lisa Ballard, and 4 more authors

   In Proceedings of the 12th ACM Conference on Web Science Companion, 2020

   DOI Bib

   @inproceedings{lyle2020secret,
     title = {The Secret Life of Immortal Data},
     author = {Lyle, Kate and Lucassen, Anneke and Ballard, Lisa and Hardcastle, F. and Weal, Mark and Chapman, Adriane and Konstantinidis, George},
     booktitle = {Proceedings of the 12th ACM Conference on Web Science Companion},
     pages = {89--90},
     year = {2020},
     doi = {10.1145/3394332.3402898}
   }

2019

1. AIJ

   Foundations of Ontology-Based Data Access under Bag Semantics

   Charalampos Nikolaou, Egor V. Kostylev, George Konstantinidis, and 3 more authors

   Artificial Intelligence, 2019

   DOI Bib

   @article{nikolaou2019foundations,
     title = {Foundations of Ontology-Based Data Access under Bag Semantics},
     author = {Nikolaou, Charalampos and Kostylev, Egor V. and Konstantinidis, George and Kaminski, Mark and Cuenca Grau, Bernardo and Horrocks, Ian},
     journal = {Artificial Intelligence},
     volume = {274},
     pages = {91--132},
     year = {2019},
     doi = {10.1016/j.artint.2019.02.003}
   }

2. ISWC

   A Policy Editor for Semantic Sensor Networks

   Paolo Pareti, George Konstantinidis, and Timothy J. Norman

   In Proceedings of the 18th International Semantic Web Conference (ISWC 2019), 2019

   Bib PDF

   @inproceedings{pareti2019policy,
     title = {A Policy Editor for Semantic Sensor Networks},
     author = {Pareti, Paolo and Konstantinidis, George and Norman, Timothy J.},
     booktitle = {Proceedings of the 18th International Semantic Web Conference (ISWC 2019)},
     address = {Auckland, New Zealand},
     year = {2019},
   }

3. ISWC

   SHACL Constraints with Inference Rules

   Paolo Pareti, George Konstantinidis, Timothy J. Norman, and 1 more author

   In Proceedings of the 18th International Semantic Web Conference (ISWC 2019), Lecture Notes in Computer Science, vol. 11778, 2019

   DOI Bib

   @inproceedings{pareti2019shacl,
     title = {SHACL Constraints with Inference Rules},
     author = {Pareti, Paolo and Konstantinidis, George and Norman, Timothy J. and Şensoy, Murat},
     booktitle = {Proceedings of the 18th International Semantic Web Conference (ISWC 2019), Lecture Notes in Computer Science, vol. 11778},
     publisher = {Springer, Cham},
     year = {2019},
     doi = {10.1007/978-3-030-30793-6_31}
   }

4. I3E

   Towards an Ontology for Public Procurement Based on the Open Contracting Data Standard

   Ahmet Soylu, Brian Elvesæter, P. Turk, and 5 more authors

   In Conference on e-Business, e-Services and e-Society (I3E 2019), 2019

   DOI Bib

   @inproceedings{soylu2019towards,
     title = {Towards an Ontology for Public Procurement Based on the Open Contracting Data Standard},
     author = {Soylu, Ahmet and Elvesæter, Brian and Turk, P. and Roman, Dumitru and Corcho, Oscar and Simperl, Elena and Konstantinidis, George and Lech, Till Christopher},
     booktitle = {Conference on e-Business, e-Services and e-Society (I3E 2019)},
     pages = {230--237},
     publisher = {Springer, Cham},
     year = {2019},
     doi = {10.1007/978-3-030-29374-1_19}
   }

5. PODS

   Attacking Diophantus: Solving a Special Case of Bag Containment

   George Konstantinidis and Fabio Mogavero

   In Proceedings of the 38th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems (PODS 2019), 2019

   DOI Bib

   @inproceedings{konstantinidis2019diophantus,
     title = {Attacking Diophantus: Solving a Special Case of Bag Containment},
     author = {Konstantinidis, George and Mogavero, Fabio},
     booktitle = {Proceedings of the 38th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems (PODS 2019)},
     year = {2019},
     doi = {10.1145/3294052.3319689}
   }

6. ISWC

   The Need for Data Sharing Agreements in Data Management

   George Konstantinidis

   In Semantic Web Technologies for Health Data Management Workshop at the 18th International Semantic Web Conference (ISWC 2019), 2019

   Bib PDF

   @inproceedings{konstantinidis2019sharing,
     title = {The Need for Data Sharing Agreements in Data Management},
     author = {Konstantinidis, George},
     booktitle = {Semantic Web Technologies for Health Data Management Workshop at the 18th International Semantic Web Conference (ISWC 2019)},
     pages = {5--8},
     year = {2019},
   }