1. Department of Safety and Quality, Faculty of Mechanical Engineering, Technical University of Kosice, Letna 1/9, 04200 Košice, Slovakia
2. Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Kosice, Letna 1/9, 04200 Košice, Slovakia
3. ECO-Invest, Námestie SNP, Obchodná 2, 81108 Bratislava, Slovakia