1. Department of Mathematics and Statistics, Riphah International University, Islamabad 45210, Pakistan
2. Department of Mathematics COMSATS Institute of Information Technology, Abbottabad, Pakistan
3. Department of Mathematics, College of Science Al-Zul, Majmaah University, Al-Majmaah 11952, Saudi Arabia
4. Mathematics Department, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia
5. Department of Mathematics, Bonga University, Bonga, Ethiopia