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2. A Mandioca na Amazônia;de Albuquerque,1969
3. The Evolution of Social Behavior;Alexander;Annual Review of Ecology and Systematics,1974
4. Group Selection, Altruism and the Levels of Organization of Life;Alexander;Annual Review of Ecology and Systematics,1978
5. The Observational Study of Behavior;Altmann;Behaviour,1974