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Aman Ullah Chaudhry and M.A. Rashid Goheer
Pakistan Journal of Biological Sciences 2 ( 3 ): 791 - 793 , 1999
Aman Ullah Chaudhry and Javeed Khalid Malik
Pakistan Journal of Biological Sciences 3 ( 12 ): 1994 - 1995 , 2000