1. Department of Mathematics, University of Mazandaran, P.O.Box 416, Pasdaran Street, Babolsar 47416-95447, Iran e-mail:
2. Faculty of Engineering Department of Chemical and Materials Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
3. Department of Mathematics and Computer Sciences, Cankaya University, Ankara 06530, Turkey
4. Institute of Space Sciences, Magurele-Bucharest 077125, Romania e-mail: