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Chapman, C. A.; Chapman, L. J.; Naughton-Treves, L.; Lawes, M. J.; McDowell, L. R. (фебруар 2004). „Predicting folivorous primate abundance: validation of a nutritional model”. American Journal of Primatology. 62 (2): 55—69. PMID14983464. doi:10.1002/ajp.20006.