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Tomasello, M., Hare, B., Lehmann, H. & Call, J. (2007). Reliance on head versus eyes in the gaze following of great apes and human infants: the cooperative eye hypothesis. Journal of Human Evolution Volume 52, Issue 3, March 2007, Pages 314-32. DOI: 10.1016/j.jhevol.2006.10.001
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Mayhew, J.A. & Gómez, J. (2015). Gorillas with white sclera: A naturally occurring variation in a morphological trait linked to social cognitive functions. American Journal of Primatologypublished 6 April 2015. DOI: 10.1002/ajp.22411
Kobayashi, H. & Koshima, S. (2001). Unique morphology of the human eye and its adaptive meaning: comparative studies on external morphology of the primate eye. Journal of Human Evolution Volume 40, Issue 5, May 2001, Pages 419-435. DOI: 10.1006/jhev.2001.0468
Tomasello, M., Hare, B., Lehmann, H. & Call, J. (2007). Reliance on head versus eyes in the gaze following of great apes and human infants: the cooperative eye hypothesis. Journal of Human Evolution Volume 52, Issue 3, March 2007, Pages 314-32. DOI: 10.1016/j.jhevol.2006.10.001