1. Department of Basic Education, Anhui Sanlian University, Hefei, China
2. Abdus Salam School of Mathematical Sciences, Government College University, Lahore, Pakistan
3. Department of Mathematics, Government College University, Lahore, Pakistan
4. Department of Mathematics, COMSATS University Islamabad, Lahore, Pakistan
5. Faculty of Education, Van Yuzuncu Yil University, Van, Turkey