[Sound spectrographic studies of normal heart sounds].
D001021:Aortic Valve; D006801:Humans; D008297:Male; D008722:Methods; D008943:Mitral Valve; D010701:Phonocardiography; D011664:Pulmonary Valve; D014261:Tricuspid Valve
Schallspektrographische Untersuchungen an normalen Herztönen.