1. Tanaka, T., S. Ihara, and Y. Koyama, JAOCS 54:269 (1977).
2. Koyama, Y., T. Hisatsune, H. Watanabe, and Y. Toyama, Yukagaku 7:210 (1958).
3. “Official and Tentative Methods of the American Oil Chemists’ Society”, Vol. I, Third Edition, AOCS, Champaign, IL, 1953, Method Cd 7-48.
4. Hopkins, C.Y., and M.J. Chisholm, JAOCS 36:210 (1959).
5. Earle, F.R., C.A. Glass, G.C. Geisinger, I.A. Wolff, and Q. Jones, Ibid. 37:440 (1960).