1. Department of Mathematics, Faculty of Science and Arts, Bozok University, 66100 Yozgat, Turkey
2. Department of Engineering Sciences, Faculty of Technology and Engineering, East of Guilan, University of Guilan, P. C. 44891-63157, Rudsar-Vajargah, Iran
3. School of Electronics and Information Engineering, Wuhan Donghu University, Wuhan-430212, P. R. China
4. Department of Mathematics, Howard University, Washington, DC-20059, USA
5. Department of Physics and Engineering, Delaware State University, Dover, DE 19901-2277, USA
6. Department of Mathematical Sciences, Delaware State University, Dover, DE 19901-2277, USA
7. Science Program, Texas A and M University at Qatar, PO. Box 23874, Doha, Qatar