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Peter Sakál
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Industrial Engineering and Management, ul. Jána Bottu 25, 917 24 Trnava, Slovak Republic
Gabriela Hrdinová
Department of Road Transport and Land Communications, Krajinská cesta 5053/13, 921 25 Piešťany, Slovak Republic