| Affiliation: | 1. Dipartimento di Matematica e Informatica, Università degli Studi di Perugia, via Vanvitelli 1, 06123 Perugia, Italy;2. Division of Mathematics, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu City, Shiga, 520-2192 Japan;3. Department of Applied Mathematics and Computer Science, Technical University of Denmark, Asmussens Allé, 2800 Kgs. Lyngby, Denmark;1. Department of Mathematics, Faculty of Mathematics and Physics, Charles University, Sokolovská 83, 186 75 Prague 8, Czech Republic;2. Institut de Mathématiques de Toulon, campus La Garde, 83041 Toulon, France;1. Dipartimento di Matematica e Informatica, Università degli Studi di Perugia, Via Vanvitelli 1, 06123 Perugia, Italy;2. Department of Geometry and MTA–ELTE Geometric and Algebraic Combinatorics Research Group, ELTE Eötvös Loránd University, Budapest, 1117 Budapest, Pázmány Péter sétány 1/C, Hungary;3. FAMNIT, University of Primorska, 6000 Koper, Glagoljaška 8, Slovenia |
