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  1.  50
    Epigenesis and culture.Robert Fagen - 1982 - Behavioral and Brain Sciences 5 (1):10-10.
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  2.  21
    Moving beyond words.Robert Fagen - 1992 - Behavioral and Brain Sciences 15 (2):275-276.
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  3.  46
    Skill and flexibility in animal play behavior.Robert Fagen - 1982 - Behavioral and Brain Sciences 5 (1):162-162.