Calibration results of different type spring gravimeters from the repeated measurements of Estonian calibration linesOja, Tõnis; Nikolenko, T.; Türk, K.; Ellmann, Artu; Jürgenson, HarliGeophysical research abstracts2010 / p. EGU2010-13590 https://www.nordicgeodeticcommission.com/wp-content/uploads/2014/10/NKG2010_Calibration-Estonia_TOja.pdf