1. Department of Mathematics, Sri Vasavi College, Erode – 638 016, Tamilnadu, India
2. Department of Mathematics, University of Punjab, New campus, P.O. Box No. 54590, Lahore, Pakistan
3. Department of Science and Humanities, PES University, Bangalore-560085, Karnataka, India
4. Department of Mathematics, The Oxford College of Engineering, Bangalore-560068, Karnataka, India