Nagwa M. Morsi, Hayam El Gazzar, Yousry Saleh and Ashraf Hanafi
Pakistan Journal of Biological Sciences 3 ( 1 ): 20 - 23 , 2000
Nagwa M. Morsi, Yousry Saleh, Hayam El Gazzar and Ashraf Hanafi
Pakistan Journal of Biological Sciences 3 ( 2 ): 196 - 200 , 2000