Affiliation: | T.HAYAT 1,2,S.AFZAL 1,A.HENDI 3 (1.Department of Mathematics,Quaid-i-Azam University,Islamabad 45320,Pakistan,2.Department of Mathematics,King Saud University,Riyadh 11451,Saudi Arabia,3.Department of Physics,Faculty of Science,Riyadh 11321,Saudi Arabia) |