1. Department of Civil and Environmental Engineering and Architecture (DICAAR), University of Cagliari, Cagliari, Italy; WILIŚ, Gdańsk University of Technology, Gdańsk, Poland; National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
2. Departamento de Matemáticas, Universidad Nacional de Colombia, Bogotá, Colombia
3. WILIŚ, Gdańsk University of Technology, Gdańsk, Poland