@book{160973,
	author = {American Petroleum Institute, API},
	title = {DAFfy Graphs. An innovative approach for modeling the soil to groundwater pathway},
	series = {API Soil & groundwater research bulletin},
	note = {Este documento puede ser consultado en la página de API},
	url = {http://api-ep.api.org/filelibrary/bulletin6.pdf}
}