@book{19939,
	author = {Opelt, Andreas. and ebrary, Inc.},
	title = {Agile contracts},
	publisher = {Wiley,},
	year = {2013.},
	series = {Wiley series in systems engineering and management},
	address = {Hoboken, N.J. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10704035}
}