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3. Assessment of pulsed Doppler echocardiography in detection and quantification of aortic and mitral regurgitation;Quinones, M.A.; Young, J.B.; Waggoner, A.D.; Ostojic, M.C.; Ribeiro, L.G.T.; Miller, R.R.;Br HeartJ,1980
4. Non-invasive assessment and differentiation of left ventricular outflow obstruction with Doppler ultrasound;Hatle, L.;Circulation,1981
5. Nichtinvasive Beurteilung von Druckgradienten bei Aortenstenose mit Doppler Ultraschall;Hoffmann, A.; Amann, F.W.; Burckhardt, D.;Schweiz Med Wochenschr,1982