1. Besabe, H., Hojman, D., and R6semblit, E. (1954). Rev. Asoc. med. argent., 68, 173.
2. Angiocardiography;Dotter, C.T.; Steinberg, I.;Amer. J. Roentgenol,1951
3. Falholt, W., and Thomsen, G. (1953). Circulation, 8, 549.
4. Jones, A. M., and Langley, F. A. (1949). Brit. Heart J., 11, 325.
5. Merten, C., Finby, N., and Steinberg, I. (1955). Amer. J. Med. (In press).