Authors
Piotr Gorzelanczyk
piotr.gorzelanczyk@ans.pila.pl
Stanislaw Staszic State University of Applied Sciences in Pila, Pila, Poland
Martin Jurkovič
University of Zilina, Faculty of Operation and Economics of Transport and Communication, Zilina, Slovakia
Paweł Szubert
Stanislaw Staszic State University of Applied Sciences in Pila, Pila, Poland
Jolanta Olechnowicz
jolanta.olechnowicz@ans.pila.pl
Stanislaw Staszic State University of Applied Sciences in Pila, Pila, Poland