1. Bennett, C. A., and Franklin, N. L. Statistical Analysis in Chemistry and the Chemical Industry, John Wiley and Sons, Inc., New York, N. Y., 1961, pp. 319–349.
2. Ibid, pp. 328–329.
3. Hicks, C. R. Fundamental Concepts in the Design of Experiments, Holt, Rinehart and Winston, New York, N. Y., 1965, pp. 21–43.
4. Abramowitz, M., and Stegun, I. A. Handbook of Mathematical Functions, NBS Applied Mathematics Series 55, 1964, p. 947, Formula 26.6.15.
5. Snedcor, G. W., and Cochran, W. G. Statistical Methods, The Iowa State University Press, 1967, pp. 258–298.