M. Iqbal Zafar, Fawad Asif, M. Imran Khan and M. Shahbaz Bajwa
Journal of Applied Sciences 2 ( 12 ): 1115 - 1118 , 2002
Badar Naseem Siddiqui, Muhammad Zakaria Yousuf Hassan, Fawad Asif, Samra Iqbal, M. Shahbaz Bajwa and Nadeem Ashraf Mali
Journal of Applied Sciences 3 ( 3 ): 182 - 184 , 2003