1. Department of Mathematics, KPR Institute of Engineering and Technology, Coimbatore, India
2. Department of Mathematical Sciences, Federal Urdu University of Arts, Sciences & Technology, Gulshan-e-Iqbal, Karachi 75300, Pakistan
3. Department of Mathematics, Erode Arts and Science College, Erode, Tamil Nadu, India
4. Department of Mathematics and Statistics, Manipal University Jaipur, Jaipur, Rajasthan, India