1. A simple method for graphic description of cardiac auscultatory signs;Segall;Am. Heart J.,1932
2. Use of written symbols to decribe cardiovascular sounds and murmurs;Segall,1959
3. Auscultation of the heart;Ravin,1958
4. Symposium on cardiovascular sound;Leatham,1957
5. The clinical significance of the systolic murmur;Freeman;Ann. Int. Med.,1933