Evolution & Human Behavior
Volume 28, Issue 3 , Pages 193-198 , May 2007

Altruism among kin vs. nonkin: effects of cost of help and reciprocal exchange

Received 10 May 2006 ,Revised 1 January 2007 ,Accepted 9 January 2007.

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PII: S1090-5138(07)00003-7

doi: 10.1016/j.evolhumbehav.2007.01.002

Evolution & Human Behavior
Volume 28, Issue 3 , Pages 193-198 , May 2007

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