1. Jan Dlugosz University in Czestochowa
2. Faculty of Mathematics and Natural Science
3. Institute of Physics
4. 42-200 Czestochowa
5. Poland
6. AGH-University of Science and Technology
7. Faculty of Materials Science and Ceramics
8. 30-059 Cracow
9. Cracow University of Technology
10. 30-084 Cracow
11. Czestochowa University of Technology