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Štefan Václav
Institute of Production Technologies, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Ulica Jána Bottu 2781/25, 917 24 Trnava, Slovak Republic
Jozef Jurko
Technical University of Košice, Faculty of Manufacturing Technologies in Prešov, Štúrova 31, 080 01 Prešov, Slovak Republic