1. Laitman J, et al. What the nose knows: New understandings of Neaderthal upper respiratory tract specializations. Proc Natl Acad Sci USA 1996;93:10543?10545
2. Negus V. The comparative anatomy and physiology of the larynx. London, William Heinemann Medical Books, 1949
3. Crelin E. The Human Vocal Tract: Anatomy, Function, Development, and Evolution. New York, Vantage Press, 1987, p 7, 60
4. Hendricks JC, et al. The English bulldog: A natural model of sleep-disordered breathing. J Appl Physiol 1987;63:1344?1350
5. Laitman JT, Crelin ES, Conlogue GJ. The function of the epiglottis in monkey and man. Yale J Biol Med 1977;50:43?48