1. Alvarez, A. S., and Summerskill, H. W. J. (1958). Lancet, 2, 920.
2. Beaumont, J. L., Caen, J., and Bernard, J. (1956). Sang, 27,243.
3. Beaumont, J. L., Caen, J., and Bernard, J. and Willie, A. (1955). Ibid., 26, 880.
4. Beaumont, J. L., Caen, J., and Bernard, J. and Willie, A. and Lenegre, J. (1955). Bull. Soc. mid. Hop. Paris, 71, 1077.
5. "Human;Biggs, R.; Macfarlane, R.G.,1962