[1] Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow,119991, Russia
[2] Institute of Earth Sciences, University of Lausanne, Lausanne,CH-1015, Switzerland
[3] Department of Applied Mathematics and Cybernetics, Tver State University, Tver,170100, Russia
[4] Division of Nuclear Physics and Technologies, National Research Nuclear University MEPhI, Moscow,115409, Russia