1. Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001 Košice, Slovakia
2. Cancer Research Institute of Biomedical Research Center, Slovak Academy of Sciences, Dúbravská Cesta 9, 84505 Bratislava, Slovakia
3. Faculty of Science, Pavol Jozef Šafárik University in Košice, Šrobárova 2, 04154 Košice, Slovakia
4. Chuiko Institute of Surface Chemistry, National Academy of Science of Ukraine, Generala Naumova 17, 03164 Kyiv, Ukraine