1. Department of Mathematics, R.M.K. College of Engineering and Technology, Thiruvallur District,Tamil Nadu, India
2. Department of Mathematics, RMD Engineering College, Thiruvallur District, Tamil Nadu, India
3. Department of Mathematics, Cankaya University, 06530 Balgat, Ankara, Turkey; Lebanese American University, Beirut, Lebanon; and Institute of Space Sciences, Magurele-Bucharest, Romania
4. Department of Mathematics, St.John’s College, Anchal, Kollam District, Kerala, India