@article {6764,
	title = {The units of selection},
	journal = {Annual Review of Ecology and Systematics},
	volume = {1},
	year = {1970},
	note = {PDF},
	pages = {1-18},
	keywords = {evolution, evolutionary theory, selection},
	author = {Lewontin, R. C.}
}
@article {6380,
	title = {The spandrels of San Marco and the Panglossian paradigm: a critique of the adaptationist programme},
	journal = {Proceedings of the Royal Society of London. Series B},
	volume = {205},
	year = {1979},
	note = {PDF},
	pages = {581-598},
	keywords = {adaptation, constraints, development, evolution, pterelectroma, pterelectroma zebra, shell morphology},
	author = {Gould, S. J. and Lewontin, R. C.}
}
