1. Be, A. W. H., Annals of the New York Academy of Sciences 109: 65 (1963).
2. BERGER, W.H., J PALEONTOL 40: 975 (1966).
3. Boltovskoy, E., Los Foraminiferos Recientes: 204 (1965).
4. Bramlette, M. N., Oceanography: 353 (1961).
5. Ericson, D. B., Scientific American 207:96 (1962).