Hauser, Marc Evolving the ingredients for reciprocity and spite. [electronic resource] - Philosophical transactions of the Royal Society of London. Series B, Biological sciences Nov 2009 - 3255-66 p. digital Publication Type: Journal Article ISSN: 1471-2970 Standard No.: 10.1098/rstb.2009.0116 doi Subjects--Topical Terms: AltruismAnimalsFamilyHumansSelection, Genetic