1. The Symballophone;Kerr;West. J. Surg.,1941
2. The Stethoscope and Symballophone;Kerr,1944
3. Diagnostic Value of Cardiac Auscultation;Levine;J. A. M. A.,1949
4. Clinical Auscultation of the Heart;Levine,1949
5. Valved Stethoscope With Logarithmically Variable Passage;Lepeschkin,1950