Affiliation: | 1.Arctic and Antarctic Research Institute, ul. Beringa 38, St. Petersburg, 199397, Russia ;2.Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034, Russia ;3.Institute of Planetary Geodesy, Technical University of Dresden, Helmholtzstrae 10, Dresden, 01069, Germany ; |