1. C.M. Starks, J. Am. Chem. Soc, 93, 195 (1971).
2. C.M. Starks and D.R. Napier, to Continental Oil Co., U.S. Patent 3,992,432 (1976);
3. C.M. Starks and D.R. Napier, to Continental Oil Co., Australian Patent 439,286 (1968);
4. C.M. Starks and D.R. Napier, to Continental Oil Co., British Patent 1,227,144 (1971);
5. C.M. Starks and D.R. Napier, to Continental Oil Co., Netherlands Patent 6,804,687 (1968).