1. Department of Mathematics, Rajalakshmi Engineering College, Chennai, India
2. Department of Mathematics, Panimalar Engineering College, Chennai, India
3. Department of Mathematics, St. Joseph’s College of Engineering, Chennai, India
4. Faculty of Mathematics and Physics, University of Ljubljana, Slovenia
5. Faculty of Natural Sciences and Mathematics, University of Maribor, Slovenia
6. Institute of Mathematics, Physics and Mechanics, Ljubljana, Slovenia