1. Department of Mathematics, Vivekananda College, Madurai, Tamil Nadu, India
2. Department of Mathematics, Karunya Institute of Technology and Sciences (Deemed to be University), Coimbatore, Tamil Nadu, India.
3. Department of Mathematics and Computer Sciences, Faculty of Arts and Sciences, Cankaya University, Ankara, Turkey + Institute of Space Sciences, Magurele-Bucharest, Romania
4. Department of Mathematics, Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Tamil Nadu, India