1. Theoretical Physics Group, Department of Physics, University of Port Harcourt, P.M.B. 5323 Choba, Port Harcourt, Nigeria
2. Department of Physics, University of Benin, Benin City, Edo State, Nigeria
3. Department of Physical Sciences, Landmark University, Omu-Aran, Nigeria
4. Department of Physics, Shahrood University of Technology, Shahrood, Iran