1. Institute of Numerical Sciences, Kohat University of Science and Technology, Kohat, Pakistan
2. Govt: Degree College Mardan, Mardan 23200, Pakistan
3. Department of Mathematics and Statistics, PMAS Arid Agriculture University, Rawalpindi, Pakistan
4. Department of Mathematics and Informatics, University of Agadez, Agadez, Niger
5. International Chair of Mathematical Physics and Applications (ICMPA-UNESCO Chair), University of Abomey-Calavi, Post Box 072, Cotonou 50, Benin
6. School of Mathematical Sciences and Shanghai Key Laboratory of PMMP, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China