@article {335081,
	title = {Why People Punish Defectors: Weak conformist transmission can stabilize costly enforcement of norms in cooperative dilemmas},
	journal = {Journal of Theoretical Biology},
	volume = {208},
	number = {1},
	year = {2001},
	pages = {79-89},
	author = {Henrich, J. and Boyd, R.}
}
