Authors
Larbi Rakhimi
Department of Mathematics, Faculty of Sciences Aïn Chock, University Hassan II, Casablanca, Morocco
Abdelmajid Khadari
Department of Mathematics, Faculty of Sciences Aïn Chock, University Hassan II, Casablanca, Morocco
Radouan Daher
Department of Mathematics, Faculty of Sciences Aïn Chock, University Hassan II, Casablanca, Morocco