@misc{cogprints843,
          volume = {64},
           title = {Varieties of altruism - and the common ground between them},
          author = {Nicholas Humphrey},
            year = {1997},
           pages = {199--209},
         journal = {Social Research},
        keywords = {altruism, kin selection, reciprocal altruism},
             url = {http://cogprints.org/843/},
        abstract = {None}
}

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