1. Lambrecht, K., Handbuch der Palaeornithologie, 212 (Borntraeger, Berlin, 1933).
2. Koechlin, J., in Biogeography and Ecology in Madagascar (edit. by Battistini, R. C., and Richard-Vindard, G.), 145 (Junk, The Hague, 1972).
3. Suess, H. E., in Nobel Symposium 12: Radiocarbon Variations and Absolute Chronology (edit. by Olsson, I. E.), 303 and appendix (Almqvist and Wiksell, Stockholm, 1970).
4. Berger, R., and Libby, W. F., Radiocarbon (in the press).
5. Battistini, R., Soc. geol. Fr., 7, 174, 309 (1965).