@article{Bordignon2006,
	title = {On enhanced cooperation},
	author = {Massimo Bordignon and Sandro Brusco},
	journal = {Journal of Public Economics},
	month = {Nov},
	number = {10-11},
	pages = {2063--2090},
	url = {http://www.sciencedirect.com/science/article/B6V76-4JRKVFF-1/1/98670e5076d0f2b8a0d99218a4efe363},
	volume = {90},
	year = {2006},
	biburl = {http://www.bibsonomy.org/bibtex/23ad7bceef8ecebf109e5704bfd56858f/smicha},
	keywords = {International unions }
}