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• Ontology-based development of location based servicesHaav, Hele-Mai; Kaljuvee, Aivi; Luts, Martin; Vajakas, ToivoDatabases and Information Systems : proceedings of the Ninth International Baltic Conference, Baltic DB&IS 2010 : Riga, Latvia, July 5-7, 20102010 / p. 11-26 : ill
• Ontology-based retrieval of spatially related objects for location based servicesHaav, Hele-Mai; Kaljuvee, Aivi; Luts, Martin; Vajakas, ToivoOn the Move to Meaningful Internet Systems : OTM 2009 : Confederated International Conferences CoopIS, DOA, IS and ODBASE 2009 : Vilamoura, Portugal, November 1-6, 2009 : proceedings. Part II2009 / p. 1010-1024 https://link.springer.com/chapter/10.1007/978-3-642-05151-7_19
• Ontology-driven development of personalized location based servicesHaav, Hele-Mai; Kaljuvee, Aivi; Luts, Martin; Vajakas, ToivoDatabases and Information Systems VI : selected papers from the Ninth International Baltic Conference : DB&IS 20102011 / p. 3-18 https://www.researchgate.net/publication/221278074_Ontology-Driven_Development_of_Personalized_Location_Based_Services
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