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Ľubomír Šmida
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Industrial Engineering and Management, Paulínska 16, 917 24, Slovak Republic
Peter Sakál
Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Industrial Engineering and Management, Paulínska 16, 917 24, Slovak Republic