1. Department of Mathematics, Azad Jammu & Kashmir University, Muzaffarabad 13100, Pakistan
2. Department of Mathematics & Statistics, Manipal University Jaipur, Rajasthan, India
3. Department of Mathematics and Statistics, International Islamic University, Islamabad 44000, Pakistan
4. Department of Electrical and Computer Engineering, College of Engineering and Technology, Wollega University, Nekemte, Ethiopia