Mubina Farid, Samina Farid, M. Alamgir and Saif -ur-Rehman
Journal of Applied Sciences 2 ( 5 ): 579 - 583 , 2002
Samina Farid, Mehnaz Gul, Asma Usman and Khuram Iqbal
Journal of Applied Sciences 2 ( 8 ): 822 - 825 , 2002