1. Department of Mathematics, Guelma University, 24000 Guelma, Algeria
2. Department of Chemical and Materials Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia
3. Department of Mathematics and Computer Sciences, Cankaya University, 06530 Ankara, Turkey
4. Institute of Space Sciences, Magurele, Bucharest, Romania