Mirza Hassan, Naveed Akhtar, Muhammad Riaz and Akhter Ali
Pakistan Journal of Biological Sciences 3 ( 3 ): 493 - 495 , 2000
Naveed Akhtar, Mirza Hassan, Akhtar Ali and Muhammad Riaz
Pakistan Journal of Biological Sciences 3 ( 4 ): 647 - 648 , 2000