1. Bendoraitis, J. G., Brown, B. L., and Hepner, L. S., Proc. Sixth World Petrol. Cong., section 5, 13 (1963).
2. Martin, R. L., Winters, J. C., and Williams, J. A., Proc. Sixth World Petrol. Cong., section 5, 252 (1963).
3. Dean, R. A., and Whitehead, E. V., Proc. Sixth World Petrol. Cong., section 5, 261 (1963).
4. Welte, D., Erdöl u Kohle, 20, 65 (1967).
5. Robinson, W. E., Cummins, J. J., and Dinneen, G. U., Geochim. Cosmochim. Acta, 29, 249 (1965).