TY JOUR TI Measuring sea ice thickness with the LOZA georadar KW Sea ice thickness KW ice formations KW georadar KW GPR JO Russian Journal of Earth Sciences AU Morozov, P.A. AU Berkut, A.I. AU Vorovsky, P.L. AU Morozov, F.P. AU Pisarev, S.V. PY 2021 IS 21 PB Geophysical Center of the Russian Academy of Sciences