1. Arrilaga, F. C., and Taquini, A. C. (1941). Rev. argent. Cardiol., 8, 43.
2. Coblentz, B., Harvey, R. M., Ferrer, M. I., Cournand, A., and Richard, D. W. (1949). Brit. Heart J., 11, 1.
3. Cossio, P., and Berconsky, 1. (1943). Rev. argent. Cardiol., 10, 162. Cuffer and Barbillon (1887). Arch. gen. mid., 1, 129 and 301.
4. Dock, W. (1933). Arch. intern. Med., 51, 737.
5. Evans, W. (1943). Brit. Heart J., 5, 205.