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• Gabriel Eduard VˆILCU Petroleum-Gas University of Ploie¸sti Department of Mathematics and Computer Science Bulevardul Bucure¸sti, Nr. 39, Ploie¸sti-ROMANIA University of Bucharest Faculty of Mathematics and Computer Science Research Center in Geometry, Topology and Algebra Str. Academiei, Nr. 14, Sector 1, Bucure¸sti-ROMANIA e-mail: gvilcu@mail.upg-ploiesti.ro