@article{Kamien1973,
	title = {Exclusion, externalities, and public goods},
	author = {Morton I. Kamien and Nancy L. Schwartz and Donald John Roberts},
	journal = {Journal of Public Economics},
	month = {Jul},
	number = {3},
	pages = {217--230},
	url = {http://www.sciencedirect.com/science/article/B6V76-45DMXY0-18/1/2f7e23d8bac358e2faa7ddfef9d7bc34},
	volume = {2},
	year = {1973},
	biburl = {http://www.bibsonomy.org/bibtex/2e88e6296fc78104ad5ce4351405f0fce/smicha},
	keywords = {imported }
}