1. Determination of pressure in the pulmonary artery by external graphic recordings;Burstin, L.;Br HeartJ,1967
2. Transcutaneous measurement of blood flow velocity in the human aorta;Angelsen, B.A.J.; Brubakk, A.;Cardiovasc Res,1976
3. Diagnosis of valvular heart disease using transcutaneous Doppler ultrasound;Brubakk, A.O.; Angelsen, B.A.J.; Hatle, L.;Cardiovasc Res,1977
4. Noninvasive assessment of pressure drop in mitral stenosis by Doppler ultrasound;Hatle, L.; Brubakk, A.; Tromsdal, A.; Angelsen, B.;Br Heart J,1978
5. Determination of pressure gradient in mitral stenosis with a noninvasive ultrasound Doppler technique;Holen, J.; Aaslid, R.; Landmark, K.; Simonsen, S.;Acta Med Scand,1976