1. Department of Business Management and Environmental Engineering, Faculty of Mechanical Engineering, Technical University of Kosice, 040 01 Kosice, Slovakia
2. Department of Automotive Production, Faculty of Mechanical Engineering, Technical University of Kosice, 040 01 Kosice, Slovakia
3. Department of Manufacturing Production Engineering, Rzeszow University of Technology, 35-959 Rzeszow, Poland
4. U.S. Steel Kosice, s.r.o., 044 54 Kosice, Slovakia