Distributed Execution of Spatial SQL Queries. - Konstantinos Giannousis; Konstantina Bereta; Nikolaos Karalis; Manolis Koubarakis (IEEE BigData, 2018)

Template-Based Question Answering over Linked Geospatial Data. - Dharmen Punjani; Kuldeep Singh 001; Andreas Both 001; Manolis Koubarakis; Iosif Angelidis; Konstantina Bereta; Themis Beris; Dimitris Bilidas; Theofilos Ioannidis; Nikolaos Karalis; Christoph Lange 002; Despina-Athanasia Pantazi; et al. (GIR@SIGSPATIAL, 2018)

GeoTriples: Transforming geospatial data into RDF graphs using R2RML and RML mappings. - Kostis Kyzirakos; Dimitrianos Savva; Ioannis Vlachopoulos; Alexandros Vasileiou 003; Nikolaos Karalis; Manolis Koubarakis; Stefan Manegold (J. Web Semant., 2018)

Extending the YAGO2 Knowledge Graph with Precise Geospatial Knowledge. - Nikolaos Karalis; Georgios M. Mandilaras; Manolis Koubarakis (ISWC (2), 2019)

Template-Based Question Answering over Linked Geospatial Data. - Dharmen Punjani; Markos Iliakis; Theodoros Stefou; Kuldeep Singh 001; Andreas Both 001; Manolis Koubarakis; Iosif Angelidis; Konstantina Bereta; Themis Beris; Dimitris Bilidas; Theofilos Ioannidis; Nikolaos Karalis; et al. (CoRR, 2020)

Extending YAGO4 Knowledge Graph with Geospatial Knowledge. - Maria Despoina Siampou; Nikolaos Karalis; Manolis Koubarakis (GeoLD@ESWC, 2022)

Native Execution of GraphQL Queries over RDF Graphs Using Multi-Way Joins. - Nikolaos Karalis; Alexander Bigerl; Axel-Cyrille Ngonga Ngomo (SEMANTiCS, 2023)

Class Expression Learning with Multiple Representations. - Axel-Cyrille Ngonga Ngomo; Caglar Demir; N'Dah Jean Kouagou; Stefan Heindorf; Nikolaos Karalis; Alexander Bigerl (Compendium of Neurosymbolic Artificial Intelligence, 2023)

Efficient Evaluation of Conjunctive Regular Path Queries Using Multi-way Joins. - Nikolaos Karalis; Alexander Bigerl; Liss Heidrich; Mohamed Ahmed Sherif; Axel-Cyrille Ngonga Ngomo (ESWC (1), 2024)

Evaluating Negation with Multi-way Joins Accelerates Class Expression Learning. - Nikolaos Karalis; Alexander Bigerl; Caglar Demir; Liss Heidrich; Axel-Cyrille Ngonga Ngomo (ECML/PKDD (6), 2024)