@book{251738,
	author = {Ellenberg, Hermann},
	title = {Biological monitoring : signals from the environment},
	publisher = {Vieweg},
	year = {1991},
	address = {Brunswick},
	note = {Publication of the Deutsches Zentrum fwicklungstechnologien - GATE, a Division of the Deutsche Gesellschaft fhnische Zusammenarbeit (GTZ) GmbH}
}