ENEXA Publications

2025

Journal Articles

• Detecting and Fixing Inconsistencies in Large Knowledge Graphs
  Charilaos Akasiadis, Anastasios Nentidis, Angelos Charalambidis, Alexander Artikis
  The European Journal on Artificial Intelligence

• Ontolearn—A Framework for Large-scale OWL Class Expression Learning in Python
  Caglar Demir, Alkid Baci, N’Dah Jean Kouagou, Leonie Nora Sieger, Stefan Heindorf, Simon Bin, Lukas Blübaum, Alexander Bigerl, Axel-Cyrille Ngonga Ngomo
  Journal of Machine Learning Research

• Resilience in Knowledge Graph Embeddings
  Arnab Sharma, N’Dah Jean Kouagou, Axel-Cyrille Ngonga Ngomo
  Transactions on Graph Data and Knowledge

Conference and Workshop Papers

• Designing Hierarchies for Optimal Hyperbolic Embedding
  Melika Ayoughi, Max van Spengler, Pascal Mettes, Paul Groth
  Lecture Notes in Computer Science, The Semantic Web (ESWC 2025)

• Artisanal and small-scale gold mining detection in the Amazon forest using contextual data
  Selma Dissing, Jan-Christoph Kalo
  Proc. of the 2025 conference on Big Data from Space (BiDS’25)

• Dung’s Argumentation Framework: Unveiling the Expressive Power with Inconsistent Databases
  Yasir Mahmood, Markus Hecher, Axel-Cyrille Ngonga Ngomo
  Proceedings of the AAAI Conference on Artificial Intelligence

• Facets in Argumentation: A Formal Approach to Argument Significance
  Johannes K. Fichte, Nicolas Fröhlich, Markus Hecher, Victor Lagerkvist, Yasir Mahmood, Arne Meier, Jonathan Persson
  Proceedings of the Thirty-Fourth International Joint Conference on Artificial Intelligence

• Prompting LLMs for the Run-Time Event Calculus
  Andreas Kouvaras, Periklis Mantenoglou, Alexander Artikis
  32nd International Symposium on Temporal Representation and Reasoning (TIME 2025)

• Sound and Complete Neurosymbolic Reasoning with LLM-Grounded Interpretations
  Bradley P. Allen, Prateek Chhikara, Thomas Macaulay Ferguson, Filip Ilievski, Paul Groth
  Proceedings of the 19th Conference on Neurosymbolic Learning and Reasoning

2024

Journal Articles

• Parameterized complexity of weighted team definability
  Juha Kontinen, Yasir Mahmood, Arne Meier, Heribert Vollmer
  Mathematical Structures in Computer Science

• Testing prompt engineering methods for knowledge extraction from text
  Fina Polat, Ilaria Tiddi, Paul Groth
  Semantic Web Journal

Conference and Workshop Papers

• Efficient Evaluation of Conjunctive Regular Path Queries Using Multi-way Joins
  Nikolaos Karalis, Alexander Bigerl, Liss Heidrich, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo The Semantic Web. ESWC 2024

• A Benchmark for the Detection of Metalinguistic Disagreements between LLMs and Knowledge Graphs
  Bradley P. Allen, Paul Groth
  Proceedings of the Special Session on Harmonising Generative AI and Semantic Web Technologies (HGAIS 2024) 2024

• A Tensor-Based Formalization of the Event Calculus
  Efthimis Tsilionis, Alexander Artikis, and Georgios Paliouras
  International Joint Conference on Artificial Intelligence

• Blink: Blank Node Matching Using Embeddings
  Alexander Becker, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, The Semantic Web – ISWC 2024

• CYCLE: Cross-Year Contrastive Learning in Entity-Linking
  Pengyu Zhang, Congfeng Cao, Klim Zaporojets, Paul Groth
  Proceedings of the 33rd ACM International Conference on Information and Knowledge Management

• Detecting and Fixing Inconsistency of Large Knowledge Graphs
  Charilaos Akasiadis, Anastasios Nentidis, Angelos Charalambidis, Alexander Artikis
  Proceedings of the 13th Hellenic Conference on Artificial Intelligence

• Embedding Knowledge Graphs in Degenerate Clifford Algebras
  Kamdem Teyou, Louis Mozart; Demir, Caglar; Ngonga Ngomo, Axel-Cyrille
  Frontiers in Artificial Intelligence and Applications

• Enhancing Answers Verbalization Using Large Language Models
  Daniel Vollmers, Parth Sharma, Hamada M. Zahera, Axel-Cyrille Ngonga-Ngomo
  Studies on the Semantic Web, Knowledge Graphs in the Age of Language Models and Neuro-Symbolic AI

• Error Analysis of Multilingual Language Models in Machine Translation: A Case Study of English-Amharic Translation
  Hizkiel Mitiku Alemayehu, Hamada M Zahera, Axel-Cyrille Ngonga Ngomo
  Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing

• Evaluating Negation with Multi-way Joins Accelerates Class Expression Learning
  Nikolaos Karalis, Alexander Bigerl, Caglar Demir, Liss Heidrich, Axel-Cyrille Ngonga Ngomo
  ECML PKDD 2024

• Generating SPARQL from Natural Language Using Chain-of-Thoughts Prompting
  Hamada M. Zahera, Manzoor Ali, Mohamed Ahmed Sherif, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Studies on the Semantic Web, Knowledge Graphs in the Age of Language Models and Neuro-Symbolic AI

• Quantitative Claim-Centric Reasoning in Logic-Based Argumentation
  Markus Hecher, Yasir Mahmood, Arne Meier, Johannes Schmidt
  Proceedings of the Thirty-ThirdInternational Joint Conference on Artificial Intelligence

• ROCES: Robust Class Expression Synthesis in Description Logics via Iterative Sampling
  N’Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo
  Proceedings of the Thirty-ThirdInternational Joint Conference on Artificial Intelligence

• Rejection in Abstract Argumentation: Harder Than Acceptance?
  Johannes K. Fichte, Markus Hecher, Yasir Mahmood, Arne Meier
  Frontiers in Artificial Intelligence and Applications, ECAI 2024

• SHROOM-INDElab at SemEval-2024 Task 6: Zero- and Few-Shot LLM-Based Classification for Hallucination Detection
  Bradley Allen, Fina Polat, Paul Groth
  Proceedings of the 18th International Workshop on Semantic Evaluation (SemEval-2024)

• TIGER: Temporally Improved Graph Entity Linker
  Pengyu Zhang, Congfeng Cao, Paul Groth
  Frontiers in Artificial Intelligence and Applications, ECAI 2024

• Universal Knowledge Graph Embeddings
  N’Dah Jean Kouagou, Caglar Demir, Hamada M. Zahera, Adrian Wilke, Stefan Heindorf, Jiayi Li, Axel-Cyrille Ngonga Ngomo

2023

Journal Articles

• Data journeys: Explaining AI workflows through abstraction
  Enrico Daga, Paul Groth
  Semantic Web

• Evaluating FAIR Digital Object and Linked Data as distributed object systems
  Stian Soiland-Reyes; Carole Goble; Paul Groth
  PeerJ Computer Science

• Knowledge Engineering Using Large Language Models
  Bradley P. Allen, Lise Stork, Paul Groth
  Transactions on Graph Data and Knowledge (TGDK)

• NELLIE: Never-Ending Linking for Linked Open Data
  Abdullah Fathi Ahmed, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo
  IEEE Access, 11

• Online event recognition over noisy data streams
  Periklis Mantenoglou, Alexander Artikis, Georgios Paliouras
  International Journal of Approximate Reasoning, 161

Conference and Workshop Papers

• ANTS: Abstractive Entity Summarization in Knowledge Graphs
  Asep Fajar Firmansyah, Hamada M. Zahera, Mohamed Ahmed Sherif, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, The Semantic Web

• An Event Calculus for Run-Time Reasoning
  Periklis Mantenoglou
  30th International Symposium on Temporal Representation and Reasoning (TIME 2023)

• AutoCL: AutoML for Concept Learning
  Jiayi Li, Sheetal Satheesh, Stefan Heindorf, Diego Moussallem, René Speck, Axel-Cyrille Ngonga Ngomo
  Communications in Computer and Information Science, Explainable Artificial Intelligence

• COBALT: A Content-Based Similarity Approach for Link Discovery over Geospatial Knowledge Graphs
  Alexander Becker, Abdullah Ahmed, Mohamed Ahmed Sherif, Axel-Cyrille Ngonga Ngomo
  Studies on the Semantic Web, Knowledge Graphs: Semantics, Machine Learning, and Languages

• Clifford Embeddings – A Generalized Approach for Embedding in Normed Algebras
  Caglar Demir, Axel-Cyrille Ngonga Ngomo

• Computing Repairs Under Functional and Inclusion Dependencies via Argumentation
  Yasir Mahmood, Jonni Virtema, Timon Barlag, Axel-Cyrille Ngonga Ngomo

• Do Instruction-tuned Large Language Models Help with Relation Extraction?
  Xue Li, Fina Polat, Paul Groth
  Joint proceedings of the KBC-LM workshop and the LM-KBC challenge at ISWC 2023

• ESLM: Improving Entity Summarization by Leveraging Language Models
  Asep Fajar Firmansyah, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, The Semantic Web

• Enhancing Relation Extraction Through Augmented Data: Large Language Models Unleashed
  Manzoor Ali, Muhammad Sohail Nisar, Muhammad Saleem, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, Natural Language Processing and Information Systems

• Explainable Integration of Knowledge Graphs using Large Language Models
  Abdullah Fathi Ahmed, Asep Fajar Firmansyah, Mohamed Ahmed Sherif, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Natural Language Processing and Information Systems. Lecture Notes in Computer Science.

• Improving Graph-to-Text Generation Using Cycle Training
  Fina Polat, Ilaria Tiddi, Paul Groth, Piek Vossen
  Proceedings of the 4th Conference on Language, Data and Knowledge

• IndEL: Indonesian Entity Linking Benchmark Dataset for General and Specific Domains
  Ria Hari Gusmita, Muhammad Faruq Amiral Abshar, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, Natural Language Processing and Information Systems

• Knowledge-centric Prompt Composition for Knowledge Base Construction from Pre-trained Language Models
  Xue Li, Anthony James Hughes, Majlinda Llugiqi, Fina Polat, Paul Groth, Fajar J. Ekaputra
  Joint proceedings of the KBC-LM workshop and the LM-KBC challenge at ISWC 2023

• Learning Permutation-Invariant Embeddings for Description Logic Concepts
  Caglar Demir, Axel-Cyrille Ngonga Ngomo
  Advances in Intelligent Data Analysis XXI. Lecture Notes in Computer Science.

• Logics with probabilistic team semantics and the Boolean negation
  Miika Hannula, Minna Hirvonen, Juha Kontinen, Yasir Mahmood, Arne Meier, Jonni Virtema

• Native Execution of GraphQL Queries over RDF Graphs Using Multi-way Joins
  Nikolaos Karalis, Alexander Bigerl, Axel-Cyrille Ngonga Ngomo

• Neural Class Expression Synthesis
  N’Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

• Neural Class Expression Synthesis (Extended Abstract)
  N’Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

• Neural Class Expression Synthesis in ALCHIQ(D)
  N’Dah Jean Kouagou, Stefan Heindorf, Caglar Demir, Axel-Cyrille Ngonga Ngomo

• Neuro-Symbolic Class Expression Learning
  Caglar Demir, Axel-Cyrille Ngonga Ngomo

• Parameterized Complexity of Propositional Inclusion and Independence Logic
  Yasir Mahmood, Jonni Virtema

• Quantitative Reasoning and Structural Complexity for Claim-Centric Argumentation
  Johannes K. Fichte, Markus Hecher, Yasir Mahmood, Arne Meier

• TemporalFC: A Temporal Fact Checking approach over Knowledge Graphs
  Umair Qudus, Michael Röder, Sabrina Kirrane, Axel-Cyrille Ngonga Ngomo

• UniQ-Gen: Unified Query Generation Across Multiple Knowledge Graphs
  Daniel Vollmers, Nikit Srivastava, Hamada M. Zahera, Diego Moussallem, Axel-Cyrille Ngonga Ngomo
  Lecture Notes in Computer Science, Knowledge Engineering and Knowledge Management