Authors
A. Ahmed
University of Sidi Mohamed Ibn Abdellah, Faculty of Sciences Dhar El Mahraz, Laboratory LAMA, Department of Mathematics, B.P. 1796 Atlas, Fez, Morocco
M.S.B. Elemine Vall
University of Sidi Mohamed Ibn Abdellah, Faculty of Sciences Dhar El Mahraz, Laboratory LAMA, Department of Mathematics, B.P. 1796 Atlas, Fez, Morocco
A. Touzani
University of Sidi Mohamed Ibn Abdellah, Faculty of Sciences Dhar El Mahraz, Laboratory LAMA, Department of Mathematics, B.P. 1796 Atlas, Fez, Morocco