1. Department of Physics, National Open University of Nigeria, Jabi-Abuja, Nigeria; Theoretical Physics Group, Department of Physics, University of Calabar, Calabar Nigeria
2. Theoretical Physics Group, Department of Physics, University of Calabar, Calabar, Nigeria
3. Department of Physics, Federal University of Petroleum Resources, Effurun, Delta State, Nigeria
4. Department of Physics, National Open University of Nigeria, Jabi-Abuja, Nigeria