1. Department of Mathematical Sciences, College of Science, UAE University, P.O. Box 15551, Al Ain, UAE
2. Faculty of Science, Helwan University, Cairo, Egypt
3. Department of Chemical and Materials Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah 80204, Saudi Arabia
4. Department of Mathematics and Computer Sciences, Cankaya University, 06530 Ankara, Turkey
5. Institute of Space Sciences, P.O. Box MG-23, 76900 Magurele-Bucharest, Romania
6. Department of Mathematics, Bharathiar University, Coimbatore, Tamil Nadu 641046, India