1. “Hemoptysis in Rheumatic Heart Disease,”;Wolff;Am. Heart J.,1941
2. Levine, 2: “Clinical Heart Disease,” W. B. Saunders, Philadelphia and London, p. 68, Second Edition
3. “De la Stenose Mitrale avec Communication Interauriculaire,”;Lutembacher;Arch. d. Mal du Coeur (etc.), Par.,1916
4. Sweet, R.: Personal communication
5. Harken, D.: Personal communication