@booklet {335261,
	title = {Interpretative Problems with Chimpanzee Ultimatum Games[Comment on Proctor et. al.]},
	journal = {PNAS},
	volume = {110},
	number = {33},
	year = {2013},
	pages = {E3049},
	url = {http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2250049},
	author = {Henrich, J. and Silk, J. B.}
}
