1. Bennett, C. A., and N. L. Franklin: Statistical analysis in chemistry and the chemical industry, chapter 5. New York: John Wiley and Sons 1961.
2. Buijs, K., B. Chavane de Dalmassy, and M. J. Maurice: Anal. Chim. Acta (in press).
3. Dixon, W. J., and F. J. Massey: Introduction to statistical analysis, 2nd edition, chapters 7, 8, 9 and 14. New York: McGraw Hill Book Co. Inc. 1957.
4. see [3], sect. 10, 9.