Authors
Eduard Marius Crăciun
Faculty of Mechanical, Industrial and Maritime Engineering, Ovidius University of Constanta, 900527, Constanta, Romania
Marin Marin
Department of Mathematics and Computer Science, Transilvania University of Brasov, 500188, Brasov, Romania
Adrian Răbâea
Department of Mathematics and Informatics Technical University of Cluj-Napoca, N.U.C.B.M. 430122, Baia Mare, Romania