@book{9506,
	author = {Ritchey, Joseph D.},
	title = {Subsurface fluid flow /},
	publisher = {Astm Intl,},
	year = {1997.},
	series = {Ground-water and vadose zone) modeling (astm special technical publication// stp.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0803120214/chopaconline-20}
}