K. Cerans, G. Barzdins, G. Bumans, J. Ovcinnikova, S. Rikacovs, A. Romane, and M. Zviedris. A relational database semantic re-engineering technology and tools. Baltic Journal of Modern Computing, volume 2, issue 3, 2014. K. Cerans, G. Barzdins, R. Liepins, J. Ovcinnikova, S. Rikacovs, and A. Sprogis. Graphical schema editing for StarDog OWL/RDF databases using OWLGrEd/S. Proceedings of the Workshop on OWL: Experiences and Directions (OWLED), 2012. G. Barzdins, S. Rikacovs, M. Veilande, and M. Zviedris. Ontological re-engineering of medical databases. Proceedings of the Latvian Academy of Sciences, Section B: Natural, Exact, and Applied Sciences, volume 63, issue 45, 2009. G. Barzdins, S. Rikacovs, and M. Zviedris. Graphical query language as SPARQL frontend. Proceedings of the 13th East-European Conference on Advances in Databases and Information Systems (ADBIS), 2009.