Authors
A. Walczak
Warsaw, Poland
A. Niewczas
Medical University of Lublin, Department of Conservative Dentistry, Lublin, Poland
D. Pieniak
University of Economics and Innovation in Lublin, Mechanical Engineering Section, Lublin, Poland
L. Gil
University of Economics and Innovation in Lublin, Transport Section, Lublin, Poland
E. Kozłowski
Lublin University of Technology, Department of Quantitative Methods in Management, Lublin, Poland
P. Kordos
Lublin University of Technology, Institute of Transport Combustion Engines and Ecology, Lublin, Poland