1. Ames, S.R. (1972a) Tocopherols. 4. Estimation in foods and food supplements. In The Vitamins. Chemistry, Physiology, Pathology, Methods, 2nd edn, Vol. V (eds W.H. Sebrell Jr and R.S. Harris ), Academic Press, New York, pp. 225–33.
2. Ames, S.R. (1972b) Tocopherols. 5. Occurrence in foods. In The Vitamins. Chemistry, Physiology, Pathology, Methods, 2nd edn, Vol. V (eds W.H. Sebrell Jr and R.S. Harris), Academic Press, New York, pp. 233–48.
3. Ames, S.R. (1979) Biopotencies in rats of several forms of alpha-tocopherol. J. Nutr., 109, 2198–2204.
4. AOAC (1990) Alpha-tocopherol and alpha-tocopheryl acetate in foods and feeds. Colorimetric method. Final action 1972. In AOAC Official Methods of Analysis, 15th edn (ed. K. Helrich ), Association of Official Analytical Chemists, Inc., Arlington, VA, 971. 30.
5. Association of Vitamin Chemists, Inc. (1966) Methods of Vitamin Assay, 3rd edn, Interscience Publishers, New York.