Affiliation: | a Department of Mathematical Sciences, Delaware State University, Dover, DE 19901-2277, USA b Radiation Physics Laboratory, Department of Physics, Faculty of Sciences, Badji Mokhtar University, P.O. Box 12, 2300 Annaba, Algeria c Department of Mathematics, Qaid-i-Azam University, Islamabad 44000, Pakistan d Department of Physics, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia |