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Iveta Dirgová Luptáková
Department of Applied Informatics and Mathematics Faculty of Natural Science University of SS. Cyril and Methodius, Nám. J. Herdu 2, 917 01 Trnava, Slovakia tel. 033/55 65 372
Mária Bilíková
Department of Mathematics and Actuarial Science, Faculty of Economic Informatics, University of Economics in Bratislava, Dolnozemská cesta 1/b, 852 35 Bratislava, Slovakia tel. 02/672 95 842