1. PG & Research Department of Mathematics, Urumu Dhanalakshmi College, Bharathidasan University, Trichy 620019, India
2. Department of Mathematics, K. Ramakrishnan College of Engineering, Samayapuram, Trichy 621112, India
3. Faculty of Mathematics and Computer Science, Alfa BK University, 11070 Belgrade, Serbia
4. School of Electrical and Computer Engineering, Academy of Technical and Applied Studies, Vojvode Stepe 283, 11000 Belgrade, Serbia
5. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Beograd, Serbia