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2. Ind. & Eng. Chem. 18 (1926), 1346.
3. Official Methods of Chemical Analysis of the American Oil Chemists’ Society (1929), 41.
4. DeGroote, et al., Ind. & Eng. Chem., Analytical Edition 3 (1931), 250.
5. Lewkowitsch. “Oils, Fats, and Waxes,” Vol. I, 6th ed., p. 439,MacMillan (1921).