1. Faculty of Special Technology, Alexander Dubcek University of Trenčín, 911 06 Trenčín, Slovakia
2. Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland
3. Institute of Materials and Machine Mechanics, SAS, Dúbravská Cesta 9/6319, 845 13 Bratislava, Slovakia
4. Faculty of Mechanical Engineering, Brno University of Technology Technická 2896/2, Královo Pole, 616 69 Brno, Czech Republic