Authors
Zdenka Bulková
Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná, Žilina;, Slovakia
Jozef Gašparík
Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná, Žilina;, Slovakia
Lenka Černá
Faculty of Operation and Economics of Transport and Communications, University of Žilina, Univerzitná, Žilina;, Slovakia