1 Retraction to: Pramana – J. Phys. (2017) 88: 48 https://doi.org/10.1007/s12043-016-1353-0

The Editor-in-Chief has retracted this article because it shows significant overlap with previously published articles [1, 2].

Z. Amerian, A. Salar Elahi and M. Ghoranneviss have not responded to correspondence regarding this retraction. “The editor was not able to obtain a current email address for M.K. Salem.