1 | Trading company "Barwa Jarosław Czajkowski", Warkocz 3-5, 25-253 Kielce, Poland |
2 | The Railway Institute, ul. Chłopickiego 50, 04-275 Warszawa, Poland |
3 | Kielce University of Technology, Centre for Laser Technologies of Metals, Al. 1000-lecia P. P. 7, 25-314 Kielce, Poland |