1. Bates, R. C. (1958). Ann. intern. Med., 48, 1017.
2. Bland, E. F., and Jones, T. Duckett (1951). Circulation, 4, 836.
3. Bywaters, E. G. L. (1956). Ibid., 14, 1153.
4. U. S;Carmichael, D.B.;armed Forces med. J,1956
5. "The Factor of Infection in the Rheumatic;Coburn, A.F.,1931