1. G. W. Snedecor and W. G. Cochran, “Statistical Methods,” 6th Edition, Iowa State University Press, Ames, Iowa, 1967, pp. 258–338.
2. T. Ide and M. Sugano, in “Nutritional Effects on Cholesterol Metabolism,” ed. by A. C. Beynen, Transmondial, Voorthuizen, 1986, pp. 47–66.