1. J. Nikitakis, in “The CTFA Cosmetic Ingredient Handbook,” CTFA, Washington, DC, 1988, pp. 370.
2. J. B. Blumberg, in “Vitamin E. Its Usefulness in Health and in Curing Disease,” ed. by M. Mino, H. Nakamura, A. T. Diploch, and H. J. Kayden, Japan Sci. Soc. Press, Tokyo, 1993, pp. 219–229.