1. Department of Mathematics, Payame Noor University, P. O. Box 19395-4697, Tehran, Iran
2. Department of Mathematics, Faculty of Science, Al-Balqa Applied University, Salt 19117, Jordan
3. Jadara University Research Center, Jadara University, Irbid, Jordan
4. Department of Mathematics, Wollo University, P.O. Box 1145, Dessie, Ethiopia