1. Szalay, F. S. & Delson, E. Evolutionary History of the Primates (Academic, New York, 1979).
2. Hoffstetter, R. Bull. Mem. Soc. Anthrop. Paris 4, 327–346 (1977).
3. Simons, E. L. Bull. Br. Mus. nat. Hist., Geol. 7, 1–36 (1962).
4. Godinot, M. C. r. hebd. Seanc. Acad. Sci., Paris, D286, 1869–1872 (1978).
5. Gingerich, P. D. & Simons, E. L. Contr. Mus. Paleont. Univ. Mich. 24, 245–279 (1977).