1. Faculty of Mechanical Engineering, Bydgoszcz University of Sciences and Technology, 85-795 Bydgoszcz, Poland
2. Faculty of Mechanical Engineering, Cuiavian University in Włocławek, 87-800 Włocławek, Poland
3. Faculty of Special Technology, Trenčianska Univerzita Alexandra Dubčeka v Trenčíne, 911 50 Trencin, Slovakia