1. Arnso, E., Brochner-Mortensen, K., and Hastrup, B. (1951). Acta med. scand., 141, 77.
2. Ball, J. (1950). Lancet, 2, 520.
3. Bauer, W., Clark, W. S., and Kulka, J. P. (1951). Proceedings of American Rheumatism Association Annual Meeting. Annals of the Rheumatic Diseases, 10, 470.
4. Bernstein, L., and Broch, 0. J. (1949). Actac med. scand., 135, 185.
5. Bywaters, E. G. L. (1950). Brit. Heart J., 12, 101.