1. Department of Mathematics, Karnataka State Akkamahadevi Women’s University, Vijayapura, Karnataka, India
2. Department of Mathematics, Vijayanagara Sri Krishnadevaraya University, Ballari, Karnataka, India
3. Department of Physics, Faculty of Sciences, University of 20 août-Skikda, Skikda, Algeria
4. Laboratory of Mechanics, Faculty of Sciences Ain Chock, Hassan II University, Casablanca, Morocco
5. Department of Mathematics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
6. Department of Mathematics, University of Central Florida, Orlando, Fla., USA