1. Department of Mathematics, Loyola College, Chennai, India
2. Department of Mathematics, St. Joseph’s College of Engineering, Chennai, India
3. Faculty of Education, University of Maribor, Maribor, Slovenia
4. Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor, Slovenia
5. Department of Mathematics, Loyola College, University of Madras, Chennai, India
6. School of Molecular Sciences, Arizona State University, Tempe, AZ, USA