1. Department of Mathematics, Yusuf Maitama Sule University, Kano, Nigeria
2. Department of Mathematics, Firat University, Elazig, Turkey + Department of Medical Research, China Medical University, Taichung, Taiwand
3. School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing, China + Department of Mathematics, Dilla University, Dilla, Ethiopiaf
4. Department of Mathematics, Cankaya University, Ankara, Turkey + Institute of Space Sciences, Magurele-Bucharest, Romaniah
5. Faculty of Engineering Technology, Amol University of Special Modern Technologies, Amol, Iran