Document Type : Regular research papers
Authors
1 Department of Mathematics, Gaston Berger University, Sénégal
2 Department of Mathematics, Gaston Berger University
3 Institute of Mathematics and Physical Sciences, URMPM P.O. Box 613, Porto Novo, Benin
4 Faculty of Sciences Semlalia, Department of Mathematics, Cadi Ayyad University, Marrakesh, Morocco.
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