@book{5176,
	author = {Opelt, Andreas},
	title = {Agile Contracts :},
	publisher = {John Wiley & Sons,},
	year = {c 2013.},
	address = {Hoboken, New Jersey :},
	url = {https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/9781118640067?download=true}
}