1. Department of Mathematics, Vaagdevi College of Engineering (Autonomous), Warangal 506005, Telangana, India
2. Department of Physics, Faculty of Sciences, University of 20 Août 1955-Skikda, Road El-Hadaeik, B.P. 26, Skikda 21000, Algeria
3. Department of Physical Science, College of Pure and Applied Sciences, Landmark University, Omu-Aran, 251103, Nigeria
4. School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing 210044, China