1. Albright, L. F. (1965) J. Am. Oil Chem. Soc., 42, 250.
2. Allen, R. R. (1978) Paper presented at Am. Oil Chem. Soc. Short Course, June.
3. Allen, R. R. & Kiess, A. A. (1955) J. Am. Oil Chem. Soc.,32, 400.
4. Asahi Denka Kogyo (1980) Japanese Patent 55, 164, 296-A.
5. Asahi Electrochem. Ind. KK (1977) Japanese Patent J52, 085, 206-A.