1. Congenital Heart Disease;Brown, J.W.,1939
2. Ernstone, A. C. and Robins, J. A. (1931). Amer. J. Roentgen, 25, 243.
3. King, J. T. (1926). Arch. intern. Med., 38, 69.
4. Laubry, C. and Balsac, R. H. de (1937). Arch. Mal. Cffur, 30, 394.
5. Wolke, K. (1937). Acta Radiol., 18, 319.