• Implementation of GNSS-technology for climate research and numerical weather forecastRannat, Kalev; Uba, Peep; Miidla, Peep; Kivi, Rigel17th International conference on "Mathematical Modelling and Analysis" : June 6-9, 2012, Tallinn, Estonia : abstracts2012 / p. 98
• Measurements of atmospheric precipitable water by ground-based GPS receivers along the Struve-Tenner Meridian ArcRannat, Kalev; Kivi, Rigel; Uba, PeepToulouse Space Show'10 : Toulouse, France, 8-11 Juny, 2010 : proceedings2010 / [7] p
• Sea-effect snowfall case in the Baltic Sea region analysed by reanalysis, remote sensing data and convection-permitting mesoscale modellingRannat, Kalev; Keernik, Hannes; Olsson, Taru; Post, Piia; Perttula, Tuuli; Kivi, Rigel; Voormansik, TanelGeophysica2018 / p. 65–91 : ill http://www.geophysica.fi/pdf/geophysica_2018_53_olsson.pdf https://www.scopus.com/sourceid/27945 https://www.scopus.com/record/display.uri?eid=2-s2.0-85063191676&origin=inward&txGid=6c0d53c20c1049a65afdb8316d204505