Authors
Sliman Mekki
Laboratory of Mathematics, Univ Sidi Bel Abbes, Sidi-Bel-Abbès, Algeria
Tayeb Blouhi
Laboratory of Mathematics, Univ Sidi Bel Abbes, Sidi-Bel-Abbès, Algeria
Juan J. Nieto
Departamento de Análisis Matemático, Instituto de Matemáticas, Universidad de Santiago de Compostela, Spain
Abdelghani Ouahab
Laboratory of Mathematics, Univ Sidi Bel Abbes, Department of Mathematics and Informatics, The African University Ahmed Draia of Adrar, Sidi-Bel-Abbès