@book{21029,
	author = {Federer, Walter Theodore, and ebrary, Inc.},
	title = {three or more crops},
	publisher = {Springer-Verlag,},
	year = {1999.},
	series = {Springer series in statistics: statistical design and analysis for intercropping experiments ;},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=5006024}
}