Affiliation: | 1. Department of Applied Informatics, Gyula Juhász Faculty of Education, University of Szeged, POB 396, 6701, Szeged, Hungary 2. Department of Mathematics, University of Pannonia, Egyetem u. 10, 8200, Veszprém, Hungary 3. Department of Mathematics, University of Haifa, 31905, Haifa, Israel 4. Institut für Statistik und Operations Research, Universit?t Graz, Universit?tsstra?e 15, 8010, Graz, Austria 5. Alfréd Rényi Institute of Mathematics, Hungarian Academy of Sciences, Reáltanoda u. 13–15, 1053, Budapest, Hungary 6. Department of Computer Science and Systems Technology, University of Pannonia, Egyetem u. 10, 8200, Veszprém, Hungary
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