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)

Trajectory reconstruction from mobile positioning data using cell-to-cell travel time information. - Toivo Vajakas; Jaan Vajakas; Rauni Lillemets (Int. J. Geogr. Inf. Sci., 2015)

Mobility Episode Discovery in the Mobile Networks Based on Enhanced Switching Kalman Filter. - Toivo Vajakas; Tanel Kiis; Amnir Hadachi; Eero Vainikko (ICUMT, 2018)

Leveraging Call Detail Records to Uncover Azimuth Configuration Errors in Cellular Networks. - Toivo Vajakas; Amnir Hadachi; Eero Vainikko (ICT, 2025)