[Origin of heart sounds. Results of frequency analytical studies on heart sounds].
D000162:Acoustics; D006325:Heart Atria; D006326:Heart Auscultation; D006801:Humans; D008433:Mathematics; D008943:Mitral Valve; D009991:Oscillometry; D010701:Phonocardiography
Uber die Tonentstehung am Herzen. Ergebnisse frequenzanalytischer Untersuchungen an Herztönen.