@book{18832,
	author = {Ellenberg, Hermann. and German Appropriate Technology Exchange.},
	title = {Biological monitoring :},
	publisher = {Vieweg,},
	year = {c1991.},
	address = {Braunschweig :},
	note = {"A publication of Deutsches Zentrum für Entwicklungstechnologien- GATE, a division of the Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) GmbH."}
}