1. clamp was the result of excessive occlusion of the aorta, or of occlusion of the left coronary;artery, Barrett; R., N.; Daley, R.;Brit. med. J,1949
2. Personal communication;Blalock, A.,1955
3. Blalock, A. and Taussig, H. B. (1945). J. Amer. med. Ass., 128, 189.
4. Potts, W. J., Smith, S., and Gibson, S. (1946). Ibid., 132, 627.
5. Scott, H. W., and Sabiston. D. C. (1953). J. thorac. Surg., 25, 26.