1. Gabunia, L.K. & Shevyreva, N.S. Doklady Akad. Nauk. S.S.S.R. 281, 684 (1985) (translated by J. Wilson. Ulster Museum. Belfast).
2. Woodbourne, M.O. & Zinmeister, W.J. Science 218, 284 (1982).
3. Mahboubi, M., Ameur, R., Crochet, J.-Y. & Jaeger, J.-J. C. r. Acad. Sci., Paris. 297 (III), 415; ibid. 691 (1983).
4. Bown, T.M. & Simons, E.L. Nature 308, 447 (1984).
5. Marshall, L.L. in Aspects of Vertebrate History (ed. Jacob. L.L.) 345 (Museum of Northern Arizona. Flagstaff. 1980).