1. Institute of Technology, Pedagogical University, Krakow, Poland;
2. Institute of Physics, Pedagogical University, Krakow, Poland;
3. Faculty of Physics, Vilnius University, Vilnius, Lithuania;
4. Department of Physics, Oles Honchar Dnipropetrovsk National University, Dnipropetrovsk, Ukraine;
5. Institute of Computer Science, Pedagogical University, Krakow, Poland