@book{159224,
	author = {Schulze, Peter C. and ebrary, Inc.},
	title = {Measures of environmental performance and ecosystem condition},
	publisher = {National Academy Press,},
	year = {c1999.},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10041169}
}