1. Laboratory of Modeling and Mathematical Structures , Department of Mathematics , Faculty of Science and Technology of Fez , University S. M. Ben Abdellah Fez , Box 2202 , Fez , Morocco
2. Division of Science, Technology, and Mathematics , American University of Afghanistan , Kabul , Afghanistan
3. Department of Mathematics , Faculty of Sciences of Rabat, B.P. 1014 , Mohammed-V University , Rabat , Morocco