@book{18784,
	author = {Sasse, Ludwig. and German Appropriate Technology Exchange.},
	title = {Biogas plants :},
	publisher = {Vieweg,},
	year = {c1984.},
	address = {Braunschweig :},
	note = {"A publication of Deutsches Zentrum für Entwicklungstechnologien--GATE."}
}