S.M. Mehdi, A.M.Ranjha, M.Sarfraz and G.Hassan
Journal of Biological Sciences 1 ( 6 ): 429 - 431 , 2001
C. Din, S.M.Mehdi, M.Sarfraz, Ghulam Hassan and M.Sadiq
Pakistan Journal of Biological Sciences 4 ( 7 ): 815 - 817 , 2001