Authors
Denisa Olekšáková
Faculty of Mechanical Engineering, Technical University in Košice, Letná 9, 04200, Košice, Slovakia
Peter Kollár
Institute of Physics, Faculty of Science, P. J. Šafárik, Park Angelinum 9, 04154, Košice, Slovakia
Ján Füzer
Institute of Physics, Faculty of Science, P. J. Šafárik, Park Angelinum 9, 04154, Košice, Slovakia