1. Borgard, W., Med. Klin.1933, 1711.
2. Boyadjian, N., G. Dechamps, andF. van Dooren, Acta cardiol.13, 607 (1959).
3. Boyadjian, N. andJ. Hoffmann, Acta cardiol.13, 90 (1958).
4. Brüggemann, W., Medizinische1954, 256.
5. Buchem, van, F. S. P., Amer. J. Med.23, 376 (1957).