1. Bray, W. Nature 321, 726 (1986).
2. Dincauze, D. Advances in World Archaeology (eds. Wendorf, F. & Close, A.) 275–323 (Academic, London, 1984).
3. Guidon, N. & Delibrias, G. Nature 321, 769 (1986).
4. Guidon, N. & Delibrias, G. in New Evidence for the Pleistocene Peopling of the Americas (ed. Bryan, A. L.) 288–299 (Center for the Study of Early Man, Orono, 1986).
5. Dillehay, T. Scient. Am. 251(4), 100–109 (1984).