1. LSI, Department of Mathematics, Physics and Computer Science, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, B.P. 1223, Taza, Morocco
2. LIIAN, Department of Mathematics and Computer Science, Faculty of Science, Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, B.P. 1796, Atlas, Fez, Morocco
3. LISAC Laboratory, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, B.P. 1796, Atlas, Fez, Morocco