1. Diagnosis of valvular heart disease using transcutaneous Doppler ultrasound;Brubakk;Cardiovasc. Res.,1977
2. Determination of pressure in the pulmonary artery by external graphic recordings;Burstin;Brit. Heart. J.,1967
3. Noninvasive assessment of pressure drop in mitral stenosis by Doppler ultrasound;Hatle;Brit. Heart J.,1978
4. Noninvasive assessment of aortic stenosis by Doppler ultrasound;Hatle;Brit. Heart J
5. Noninvasive estimation of systolic pulmonary artery pressure;Hatle;Brit. Heart J