1. Doctoral School of the Koszalin University of Technology
2. Faculty of Mechanical Engineering, Department of Mechanics and Construction, Koszalin University of Technology, Raclawicka 15-17, 75-620, Koszalin, Poland
3. Doctoral School of the Koszalin University of Technology, Sniadeckich 2, 75-453, Koszalin, Poland