Ontology-Based Retrieval of Spatially Related Objects for Location Based Services. - Hele-Mai Haav; Aivi Kaljuvee; Martin Luts; Toivo Vajakas (OTM Conferences (2), 2009)

Ontology-driven Development of Personalized Location Based Services. - Hele-Mai Haav; Aivi Kaljuvee; Martin Luts; Toivo Vajakas (DB&IS, 2010)