Shahid Ahmad, Muhammad Yasin, Asif Ali Bhatti and Mohammad Aslam
Pakistan Journal of Biological Sciences 2 ( 1 ): 167 - 173 , 1999
Jehan Zeb, Shahid Ahmad, M. Aslam and Badruddin
Pakistan Journal of Biological Sciences 3 ( 2 ): 352 - 353 , 2000