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2. Official and Tentative Methods of the American Oil Chemists’ Society, AOCS, Champaign, IL, 1973, Method CD-14-61.
3. Firestone, D., and M. De La Luz Villadelmar, J. Assoc. Off. Anal. Chem. 44: 459 (1961).
4. Firestone, D., and P. LaBouliere, Ibid. 48: 437 (1965).
5. Hirayama, H., Z. Shimoda, S. Nakasato, Y. Murase, T. Shige, T. Takahoshi, H. Watanabe, S. Yoneyama, M. Yamashita, K. Yamanaka and H. Yoshida, Yukagaku 27: 606 (1978).