@article{Duffy2007,
	title = {Giving little by little: Dynamic voluntary contribution games},
	author = {John Duffy and Jack Ochs and Lise Vesterlund},
	journal = {Journal of Public Economics},
	month = {Sep},
	number = {9},
	pages = {1708--1730},
	url = {http://www.sciencedirect.com/science/article/B6V76-4NJ2089-1/1/4506323eae26caeddc9e209f3fd56ddd},
	volume = {91},
	year = {2007},
	biburl = {http://www.bibsonomy.org/bibtex/23b2c630b3083a626b7f72444679b0bc7/smicha},
	keywords = {Dynamic game goods public }
}