1 | Volodymyr Dahl East Ukrainian National University, pr. Central 59-a, 93400, Severodonetsk, Ukraine |
2 | University of Žilina, Univerzitná 8215/1 010 26 Žilina, Slovak Republic |
3 | Vilnius Gediminas Technical University, J. Basanavičiaus Str. 28, 03224 Vilnius, Lithuania |