Muhammad Khalid, Zahir Ahmad Zahir, Azhar Waseem and Muhammad Arshad
Pakistan Journal of Biological Sciences 2 ( 3 ): 739 - 742 , 1999
Hafiz Naeem Asghar, Zahir Ahmad Zahir, Abdul Khaliq and Muhammad Arshad
Pakistan Journal of Biological Sciences 3 ( 10 ): 1556 - 1559 , 2000