1. School of Teacher Education, Hunan City University, Yiyang 413000, China
2. Department of Mathematics, Government College (GC) University, Faisalabad 38000, Pakistan
3. School of Mathematics and Physics, Anhui Jianzhu University, Hefei 230601, China
4. Department of Mathematics, Faculty of Science and Letters, Agri Ibrahim Cecen University, Agri, Turkey
5. Department of Mathematics, SBK University, Quetta, Pakistan