| Affiliation: | 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;1. Department of Mathematics, Charles University, Sokolovská 83, 186 75 Praha 8, Czech Republic;2. Department of Mathematics, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6;1. Institute of Analysis and Number Theory, Graz University of Technology, Kopernikusgasse 24/II, A-8010 Graz, Austria;2. School of Mathematics and Statistics, University College Dublin, Belfield, Dublin 4, Ireland;3. School of Mathematics, Wits University, Johannesburg, South Africa;4. Research Group in Algebraic Structures and Applications, King Abdulaziz University, Jeddah, Saudi Arabia;5. Centro de Ciencias Matemáticas, UNAM, Morelia, Mexico |
