1. Institute of Machinery Engineering, University of Technology and Humanities in Radom, 54 Krasickiego Str., 26-600 Radom , Poland
2. Department of Physics, University of Technology and Humanities in Radom, 54 Krasickiego Str., 26-600 Radom , Poland
3. CELSA Huta Ostrowiec Sp. z o.o., Forge Division, 2 Samsonowicza Str., 27-400 Ostrowiec Świętokrzyski , Poland