1. Mair, B. J., and J. L. Martinez-Pico: Composition of the trinuelear aromatic portion of the heavy gas oil and light lubricating distillate. Proc. Am. Petrol. Inst. 42, 173 (1962).
2. Heald, H. C.: Fundamental research on the occurrence and recovery of petroleum 1952–1953. Baltimore: The Lord Baltimore Press.
3. Link, F. A.: Whence came the hydrocarbons. Bull. Am. Assoc. Petrol. Geologists 41, 1387 (1957).
4. Meinschein, W. G.: Origin of petroleum. Bull. Am. Assoc. Petrol. Geologists 43, 925 (1959).
5. Meinschein, Significance of hydrocarbons in sediments and petroleum. Geochim. Cosmochim. Acta 22, 58 (1961).