Egoism and altruism.
Unto Others: The Evolution and Psychology of Unselfish Behavior by E. Sober and D.S. Wilson Harvard University Press, 1998. $19.95 hbk (394 pages) ISBN 0 674 93046 0.
Dept of Biology, University of Oslo, PO Box 1050, Blindern, N-0316 Oslo, Norway.
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