1. Taieb, M., Johanson, D. C., Coppens, Y. & Aronson, J. L. Nature 260, 289–293 (1976).
2. Johanson, D. C., Taieb, M., Gray, B. T. & Coppens, Y. in Geological Background to Fossil Man (ed. Bishop, W. W.) (Geological Society, London, in the press).
3. Taieb, M., Johanson, D. C. & Coppens, Y. C.r. hebd. Sèanc. Acad. Sci., Paris 281D, 1297–1300 (1975).
4. Johanson, D. C. & Taieb, M. Nature 260, 293–297 (1976).
5. Johanson, D. C. & Coppens, Y. Am. J. Phys. Anthro. 45, 217–234 (1976).