1. Institute of Applied Physics, Moldova State University, MD2028 Chisinau, Moldova
2. Faculty of Electronics and Telecommunications, Technical University of Moldova, MD2004 Chisinau, Moldova
3. Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia
4. Ishlinsky Institute for Problems in Mechanics RAS, 101-1 Prospect Vernadskogo, 119526 Moscow, Russia
5. Department of Civil Engineering, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St, 117198 Moscow, Russia