1. Registrierung von Herztönen und Herzgeräuschen mittels des Phonoskops und ihre Beziehungen zum Elektrokardiogramm;Weiss;Ztschr. klin. Med.,1911
2. El primer ruido cardiaco y el sophlo presistolico en la estrechez mitral con fibrilacion;Cossio;Rev. argent. de cardiol.,1943
3. The effect of cycle length on the time of occurrence of the first heart sound and the opening snap of mitral stenosis;Messer;Circulation,1951
4. The assessment of mitral stenosis by phonocardiography;Wells;Brit. Heart J.,1954
5. Illustrations of heart-sound records;Lewis;Quart. J. Med.,1912