1. Austrian, R., McClement, J. H., Renzetti, A. D., Donald, K. W., Riley, R. L., and Cournand, A. (1951). Amer. J. Med., 11,667.
2. Bader, M. E., Bader, R. A., and Selikoff, I. J. (1957). J. clin. Invest., 36, 871.
3. Baldwin, E. DeF., Cournand, A., and Richards, D. W., Jr. (1948).
4. Ibid., 28, 1.
5. Bastenier, H., Denolin, H., Coster, A. de, and Englert, M. (1955). Arch. Mal. prof., 16, 546.