Ibrahim H. Mustafa, G. Ibrahim, Ali Elkamel and A.H. Elahwany
American Journal of Environmental Sciences 5 ( 1 ): 69 - 79 , 2009
Ibrahim H. Mustafa, G. Ibrahim, Ali Elkamel and A.H. Elahwany
American Journal of Environmental Sciences 5 ( 3 ): 352 - 363 , 2009