@article{citeulike:490030,
	title = {Evolution of cooperation without reciprocity},
	author = {Rick L. Riolo and Michael D. Cohen and Robert Axelrod},
	journal = {Nature},
	month = {November},
	number = {6862},
	pages = {441--443},
	url = {http://dx.doi.org/10.1038/35106555},
	volume = {414},
	year = {2001},
	biburl = {http://www.bibsonomy.org/bibtex/222df237d657ce0e0df7d3ea1fc3cb3e7/schmitz},
	doi = {10.1038/35106555}, citeulike-article-id = {490030}, priority = {0},
	keywords = {agent evolution folksonomy tagging }
}