1. Norris, F.A., inBailey’s Industrial Oil and Fat Products, 4th edn., vol. 2, John Wiley and Sons, New York, 1982, pp. 97–173.
2. Goings, L.H.,J. Am. Oil Chem. Soc. 44:414A (1967).
3. Sereenivasan, B.,Ibid. 55:796 (1978).
4. Gooding, C.M., U.S. Patent 3,099,564 (1963).
5. Schmidt, J.P., U.S. Patent 3,240,608 (1966).