Document Type : Research Paper
1 Department of Mathematics, Faculty of Exact Sciences and Informatics, Hassiba Benbouali University of Chlef, Algeria.
2 Laboratory of Mathematics and its Applications (LMA).
3 Department of Mathematics, Faculty of Arts and Sciences, Cankaya University, TR-06530 Ankara, Turkey.
4 Institute of Space Sciences, Magurele-Bucharest, Romania.