1. Bracey, D. W. (1961). Brit. J. clin. Pract., 15, 357.
2. Cotlove, E., Trantham, H. V., and Bowman, R. L. (1958). J. Lab. clin.
3. Flear, C. T. G., Carpenter, R. G., and Florence, I. (1965). J. clin.
4. , Crampton, R. F., and Matthews, D. M. (1960). Clin. Sci., 19, 483.
5. , Crampton, R. F., and Matthews, D. M., Crampton, R. F., and Matthews, D. M., Crampton, R. F., and Matthews, D. M., and Florence, 1. (1961). Clin. chim. Acta, 6, 129. -, - (1963). Nature (Lond.), 199, 156.