1. Barnes, B. A., Gordon, E. B., and Cope, 0. (1957). J. clin. Invest., 36, 1239.
2. Flear, C. T. G., and Florence, I. (1961). Clin. Chim. Acta, 6, 129. -, - (1963). Nature (Lond.), 199, 156.
3. Litchfield, J. A., and Gaddie, R. (1958). Clin. Sci., 17, 483.
4. Introduction to the theory of statistics;Mood, A.M.,1950
5. McGraw-Hill, New York. Talso, P. J., Spafford, N., and Blaw, M. (1953a). J. Lab. clin. Med., 41, 281.