Affiliation: | 1. Mathematical Institute, Slovak Academy of Sciences, ?tef??nikova 49, SK-814 73, Bratislava, Slovakia 2. Faculty of Industrial Technologies in P??chov, Tren???n University of Alexander Dub?ek in Tren???n, I. Krasku 491/30, SK-020 01, P??chov, Slovakia 3. Department of Mathematics Faculty of Informatics, University of Economics, Dolnozemsk?? 1, SK-852 35, Bratislava, Slovakia
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