Gravity surveys on large icecovered lakes in Estonia [Electronic resource]Oja, Tõnis; Ellmann, Artu; Bloom, Ahti; Gruno, AntiGeophysical research abstracts2010 / p. EGU2010-13761 [CD-ROM] Improving the terrestial gravity dataset in South-Estonia [Electronic resource]Oja, Tõnis; Gruno, Anti; Bloom, Ahti; Mäekivi, E.; Ellmann, Artu; All, Tarmo; Jürgenson, Harli; Michelson, M.Geophysical research abstracts2009 / p. EGU2009-10997 [CD-ROM] Relative gravity measurements on ice-covered water bodiesOja, Tõnis; Bloom, Ahti; Talvik, Silja; Jürgenson, Harli; Ellmann, Artu150th Anniversary of the IAG : book of abstracts : September 1-6, 2013, Potsdam2013 / p. 379 Relative gravity surveys on ice-covered water bodiesOja, Tõnis; Türk, Kristina; Ellmann, Artu; Gruno, Anti; Bloom, Ahti; Sulaoja, MargisThe 8th International Conference Environmental Engineering : May 19-20, 2011, Vilnius, Lithuania : selected papers. Volume III2011 / p. 1394-1401 : ill