1. Faculty of Materials Science and Technology, Slovak University of Technology, Trnava, Slovakia
2. Institute of Production Technologies, Faculty of Materials Science and Technology, Slovak University of Technology, Trnava, Slovakia
3. Department of Production Engineering, Faculty of Mechanical Engineering, Technical University of Kosice, Kosice, Slovakia
4. Departments Department of Sowfware, M. T. Kalashnikov Izhevsk State Technical University, Izhevsk, Russia