1. Baker, B. H., Mohr, P. A. and Williams, L. A. J. (1982) Geology of the Eastern Rift System of Africa. InRift Valleys Afro-Arabian. (A. M. Quennell, ed.) pp. 242–76. Benchmark Papers in Geology/60. Hutchinson Ross Publishing Company, Stroudsburg, Pennsylvania.
2. Balon, E. K. (1985) Reflections on epigenetic mechanisms. InEarly Life Histories of Fishes. (E. K. Balon, ed.) pp. 239–70. Dr. W. Junk Publishers, Dordrecht, The Netherlands.
3. Bonnefille, R. (1985) Evolution of the continental vegetation: the paleobotanical record from East Africa.S. Afr. J. Sci. 81, 267–70.
4. Brain, C. K. (1974) Some suggested procedures in the analysis of bone accumulations from southern African Quaternary sites.Ann. Transvaal Muss. 29, 1–8.
5. Bush, G. L., Case, S. M., Wilson, A. C. and Patton, J. L. (1977) Rapid speciation and chromosomal evolution in mammals.Proc. Nat. Acad. Sci. USA 74, 3942–6.