M. Ashraf, A. Khalid and K. Ali
Pakistan Journal of Biological Sciences 2 ( 3 ): 860 - 862 , 1999
Sobia Chohan, J. H. Mirza, A.S. Shakir, R.Perveen and A. Khalid
Pakistan Journal of Biological Sciences 2 ( 3 ): 996 - 997 , 1999