Ghaly A. E., N. S. Mahmoud, D. G. Rushton and F. Arab
American Journal of Agricultural and Biological Sciences 2 ( 2 ): 106 - 117 , 2007
D. G. Rushton, A. E. Ghaly and K. Martinell
American Journal of Applied Sciences 4 ( 7 ): 465 - 478 , 2007