1. Bielschowsky, M., Helyer, B. J., and Howie, J. B., Proc. Univ. Otago Med. School, 37, 9 (1959).
2. Helyer, B. J., and Howie, J. B., Proc. Univ. Otago Med. School, 39, 3 (1961).
3. Helyer, B. J., and Howie, J. B., Brit. J. Haemat., 9, 119 (1963).
4. Burnet, F. M., Austral. Ann. Med., 11, 79 (1962).
5. Holmes, Margaret C., and Burnet, F. M., Ann. Int. Med., 59, 265 (1963).