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Ľubomíra Horanská
Institute of Information Engineering, Automation and Mathematics Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava, Radlinsk´eho 9 SK–812-37 Bratislava, Slovakia
Alexandra Šipošová
Department of Mathematics and Descriptive Geometry Faculty of Civil Engineering Slovak University of Technology in Bratislava Radlinského 11 SK–810-05 Bratislava, Slovakia