Affiliation: | a Department of Physics, ?stanbul Kültür University, Bak?rköy 34156, ?stanbul, Turkey b Abdus Salam School of Mathematical Sciences, Government College University, 68-B New Muslim Town, 54600 Lahore, Pakistan c Department of Mathematics and Computer Science, ?stanbul Kültür University, Bak?rköy 34156, ?stanbul, Turkey |