Lord, «Comparison of the Sensory Development of Wolves.»
248
P. Shipman, «Do the Eyes Have It?» American Scientist 100 (2012): 198–201.
249
H. Kobayashi and S. Kohshima, "Unique Morphology of the Human Eye and Its Adaptive Meaning: Comparative Studies on External Morphology of the Primate «Eye,» Journal of Human Evolution 40 (2001): 419–435.