@book{21888,
	author = {Nahed Mohamed Mohamed Ismail and Amin A. Abo Elhasan , },
	title = {Ecological studies on the control of schistosomiasis snail vectors by some nile fishes / },
	publisher = {Nahed Mohamed Mohamed Ismail , },
	year = {1996},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}