Zakaria Yaagoub (1), Marya Sadki (2), Karam Allali (3) (1) a:1:{s:5:"en_US";s:173:"Laboratory of Mathematics, Computer Science and Applications, Faculty of Sciences and Technologies, University Hassan II of Casablanca, PO Box 146, Mohammedia 20650, Morocco";}, Morocco,
(2) Laboratory of Mathematics, Computer Science and Applications, Faculty of Sciences and Technologies, University Hassan II of Casablanca, PO Box 146, Mohammedia 20650, Morocco, Morocco,
(3) , Morocco