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ISSN: 1848-0225 Print, ISSN 1848-9931 Online, Publisher: Croatian Operational Research Society, Trg J.F. Kenneddyja 6, 10000 Zagreb, Croatia, e-mail:, Co-publishers: University of Osijek, Faculty of Economics in Osijek; University of Osijek, Department of Mathematics; University of Split, Faculty of Economics; University of Zagreb, Faculty of Economics and Business