1. Papay, A.G., Lubrication Engineering 39:419 (1983).
2. Hermann, C.L., and J.J. McGlade, JAOCS 51:88 (1974).
3. Dorinson, A., Lubrication Engineering 39:519 (1983).
4. Synthetic Organic Chemicals, U.S. Production and Sales, 1982, USITC Publication 1422, U.S. Govt. Printing Office, Washington (1983). Ibid. (for 1980) USITC Publication 1183 (1981).
5. Vienna, P., and M.J. Den Herder, U.S. Pat. 3,850,825 (Nov. 26, 1976).