1. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk, Poland
2. Physics of Metals Department, Ivan Franko National University of Lviv, L’viv, Ukraine
3. Kazimierz Wielki University in Bydgoszcz, Bydgoszcz, Poland
4. Stepan Gzhytskyi National University of Veterinary Medicine and Biotechnologies Lviv, Lviv, Ukraine