1. Faculty of Mechanics and Mathematics, Belarusian State University, Nezavisimosty Ave. 4, 220030 Minsk, Belarus
2. Department of Civil and Environmental Engineering and Architecture (DICAAR), University of Cagliari, Via Marengo 2, 09123 Cagliari, Italy
3. Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, ul. Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland