Muhammad Iqbal Zafar, Saif-ur-Rehman, Saif abbasi, Waqar Malik and Afrah Zaheer
Information Technology Journal 2 ( 1 ): 83 - 86 , 2003
M. Iqbal Zafar, M. Habib Ullah, Saif- ur-Rehman and Saif Abbasi
Journal of Applied Sciences 3 ( 6 ): 376 - 384 , 2003