1. Institut für Angewandte Mathematik (LS III), Fakultät für Mathematik, Technische Universität Dortmund, Germany
2. Department of Mathematics, Avvaiyar Government College for Women, Karaikal, U.T of Puducherry, India
3. Department of Mathematics, College of Science, King Saud University, Riyadh, Saudi Arabia
4. Department of Pure and Applied Mathematics, School of Mathematical Sciences, Sunway University, Malaysia
5. Department of Mathematics, Graphic Era (Deemed to be University), Dehardun, India