1. Department of Mathematics, COMSATS Institute of Information Technology, Abbottabad, Pakistan
2. Department of Mathematics Education, Gyeongsang National University, Jinju, Korea
3. Department of Mathematics, Hazara University, Mansehra, Pakistan
4. Department of Mathematics, College of Science in Al-Zulfi, Majmaah University, Al-Zulfi, Saudi Arabia
5. Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan