1. Allan, T. M. (1958). Brit. med. J., 2, 248.
2. Allan, T. M. (1959). Ibid., 1, 553.
3. Personal communication;Brass, W.,1963
4. In "The Rh Factor". (Blood, Special Issue No;Chown, B.;Int. Arch. Allergy,1948
5. Cohen, B. H. (1960). Amer. J. hum. Genet., 12, 180.