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Saayman, G. S. (1971). Behaviour of the adult males in a troop of free-ranging Chacma baboons (Papio ursinus). Folia Primatol (Basel), 15(1), 36–57.
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Wolf, M., van Doorn, G. S., Leimar, O., & Weissing, F. J. (2007). Wolf et al. reply. Nature, 450(7167), E5–E6.
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Halford, G.S., & Halford, J. M.. (1969). Secondary reinforcement: signal or substitute reward? A preliminary investigation. Aus. J. Psychol, .
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