1. Department of Computer Science; Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 974 01 Banská Bystrica, Slovakia
2. Department of Physical and Theoretical Chemistry; Faculty of Natural Sciences, Comenius University, Mlynská Dolina, Ilkovičova 6; 842 15 Bratislava, Slovakia
3. Computing Center of the Slovak Academy of Sciences, Dúbravská cesta č. 9; 845 35 Bratislava Slovakia