Welfare, Ethnicity and Altruism: New Data and Evolutionary ...
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... McDonald, D.A. Clifford andR. Martinez, 'Panhandling:Sharing ofResources',
Science, 191 (30 January 1976), pp. 406 8. 20. T.L.Goldberg,'Altruism
TowardsPanhandlers: Who Gives?', Human Nature, 6, 1 (1995), pp. 79 89. 21.