1. Department of Mathematics, Luoyang Normal University, Luoyang, People's Republic of China
2. Department of Mathematics, University of Ilorin, Ilorin, Nigeria
3. Department of Mathematics, Aden University, Aden, Yemen
4. School of Mathematical Sciences and Shanghai Key Laboratory of PMMP, East China Normal University, Shanghai, People's Republic of China
5. Institute of Numerical Sciences, Kohat University of Science and Technology, Kohat, Pakistan
6. Department of Mathematics Faculty of Science, Erzurum Technical University, Erzurum, Turkey