1. Methods of Estimating the Volume of Undiscovered Oil and Gas;Mackay;AAPG Studies in Geology,1975
2. L. G. Weeks—as for (1).
3. H. D. Klemme—World Oil and Gas Reserves, Unitar/IIASA Conference, July 1976, Laxenberg, Austria.
4. I. Visotsky et al.—as for (3).
5. M. T. Halbouty—OPEC Seminar, Vienna, October 1977.