1. Institute of Architecture and Urban Planning, University of Zielona Góra, 65-417 Zielona Góra, Poland
2. Institute of Civil Engineering, University of Zielona Góra, 65-516 Zielona Góra, Poland
3. Faculty of Civil and Environmental Engineering and Architecture, Bydgoszcz University of Science and Technology, 85-796 Bydgoszcz, Poland