References
- American Society of Brewing Chemists, Report of Subcommittee on Applications of Atomic Absorption Spectrophotometry to Analytical Problems in Brewing Chemistry. Proc. 1970, p. 212.
- Dixon, W. J. and Massey, F. J. Jr. Introduction to Statistical Analysis (2nd Ed.) pp. 275–278, 412. McGraw Hill, New York (1957).