@article{G�th2007,
	title = {Leading by example with and without exclusion power in voluntary contribution experiments},
	author = {Werner G{\"u}th and M. Vittoria Levati and Matthias Sutter and Eline van der Heijden},
	journal = {Journal of Public Economics},
	month = {Jun},
	number = {5-6},
	pages = {1023--1042},
	url = {http://www.sciencedirect.com/science/article/B6V76-4MRFC5J-1/1/6e2fb7f372ffa8312e82d912ed72fb15},
	volume = {91},
	year = {2007},
	biburl = {http://www.bibsonomy.org/bibtex/2f2363e9dc9fcea7174c0ab9c66539935/smicha},
	keywords = {Voluntary contribution experiment }
}