Expressive OWL Queries: Design, Evaluation, Visualization. - Petr Kremen; Bogdan Kostov (Int. J. Semantic Web Inf. Syst., 2012)

Count Aggregation in Semantic Queries. - Bogdan Kostov; Petr Kremen (SSWS@ISWC, 2013)

Efficient Exploration of Linked Data Cloud. - Jakub Klímek; Martin Necaský; Bogdan Kostov; Miroslav Blasko; Petr Kremen (DATA, 2015)

JOPA: Efficient Ontology-Based Information System Design. - Martin Ledvinka; Bogdan Kostov; Petr Kremen (ESWC (Satellite Events), 2016)

Towards Ontology-Based Safety Information Management in the Aviation Industry. - Bogdan Kostov; Jana Ahmad; Petr Kremen (OTM Workshops, 2016)

Ontological Foundations of European Coordination Centre for Accident and Incident Reporting Systems. - Petr Kremen; Bogdan Kostov; Miroslav Blasko; Jana Ahmad; Vladimír Plos; Andrej Lalis; Slobodan Stojic; Peter Vittek (J. Aerosp. Inf. Syst., 2017)

Count Distinct Semantic Queries over Multiple Linked Datasets. - Bogdan Kostov; Petr Kremen (Open J. Semantic Web, 2018)