Authors
Larbi Rakhimi
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
© 2022 Larbi Rakhimi, Radouan Daher, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.