Affiliation: | 1. Department of Mathematics and Information Technology, Montanuniversität Leoben, A-8700 Leoben, Austria;2. Department of Education, PeF, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia;3. Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia;4. Department of Mathematics, PeF, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia |