@book{29683,
	author = {Villiger, Mark Eugen,},
	title = {Customary International Law and Treaties :},
	publisher = {Brill | Nijhoff,},
	year = {1985.},
	series = {Developments in International Law ;},
	address = {Leiden ;},
	url = {http://dx.doi.org/10.1163/9789004636231}
}