Institution: | 1. Department of Mathematics, Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria;2. Department of Mathematical Sciences, Faculty of Physical Sciences, Federal University Dutsin-Ma, Katsina State, Nigeria;1. Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Physics Department, University of the Free State, Bloemfontein 9300, South Africa |