Authors
Nazih Abderrazzak Gadhi
abderrazzak.gadhinazih@usmba.ac.ma
LAMA, Sidi Mohamed Ben Abdellah University, Dhar El Mahraz, Department of Mathematics, Fes, Morocco
Aissam Ichatouhane
LAMA, Sidi Mohamed Ben Abdellah University, Dhar El Mahraz, Department of Mathematics, Fes, Morocco