1. School of Electronics and Information Engineering Wuhan Donghu University, Wuhan 430212, Peoples Republic of China
2. Department of Mathematics, Payame Noor University (PNU), P.O. Box 19395-3697, Tehran, Iran
3. Department of Engineering Sciences, Faculty of Technology and Engineering, East of Guilan, University of Guilan, P.C. 44891-63157, Rudsar-Vajargah, Iran
4. State Key Laboratory of Information Photonics and Optical Communications and School of Science, P. O. Box 122 Beijing University of Posts and Telecommunications, Beijing 100876, China
5. Department of Physics, Chemistry and Mathematics, Alabama A&M University, Normal, AL-35762, USA
6. Department of Mathematics and Statistics, Tshwane University of Technology, Pretoria-0008, South Africa