1. Bashir, H. V., Hinterberger, H., and Jones, B. P. (1966).Brit, J. Haemat., 12, 704.
2. Cox, E. V., and White, A. M. (1962). Lancet, 2, 853.
3. Giorgio, A. J., and Plaut, G. W. E. (1965). J. Lab. clin. Med., 6b, 667.
4. Gompertz, D., Jones, J. H., and Knowles, J. P. (1967). Lancet, 1, 424.
5. London The demonstration by Mattern, Brackett, and Olson;the Bland-Sutton Institute, S.T.E.W.A.R.T.From; Hospital, Middlesex,1957