1. Brit. mned. J., 2, 315.
2. -, -, and Roberts, J. A. Fraser (1953). Ibid., 1, 799.
3. -, -, and Roberts, J. A. Fraser (1955). Ibid., 2,321.
4. Alexander, W. (1921). Brit. J. exp. Path., 2, 66.
5. Association between Blood Group A and Pernicious Anaemia. Collective Series from a Number of Centres,1956