@book{206846,
	author = {Opelt, Andreas.},
	title = {Agile contracts :},
	publisher = {Wiley,},
	year = {2013.},
	series = {Wiley series in systems engineering and management},
	address = {Hoboken, N.J. :},
	url = {http://onlinelibrary.wiley.com/book/10.1002/9781118640067}
}