1. 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
2. Noninvasive assessment of pressure drop in mitral stenosis by Doppler ultrasound;Hatle, L.; Brubakk, A.; Tromsdal, A.; Angelsen, B.;Br Heart J,1978
3. Transcutaneous measurement of aortic blood velocity by ultrasound. A theoretical and experimental approach. Report 75-78-W;Angelsen, B.A.J.,1975
4. Analog estimation of the maximum frequency of Doppler spectra in ultrasonic blood velocity measurements. Report 76-21-W;Angelsen, B.A.J.,1976
5. Diagnosis of valvular heart disease using transcutaneous Doppler ultrasound;Brubakk, A.O.; Angelsen, B.A.J.; Hatle, L.;Cardiovasc Res,1977