@book{32576,
	author = {Akram Elia Farag and Ibrahim Helal Elhattab , },
	title = {Optimum design of wastewater collection networks / },
	publisher = {Akram Elia Farag , },
	year = {1995},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}