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2. Doppler echocardiographic measurement of cardiac output. Comparison with a non-golden standard;Schuster, A.H.; Nanda, N.C.;Am J Cardiol,1984
3. Evaluation of pulmonary and systemic blood flow by 2-dimensional Doppler echocardiography using fast Fourier transform spectral analysis;Goldberg, S.J.; Sahn, D.J.; Allen, H.D.; Valdes-Cruz, L.M.; Hoenecke, H.; Carnahan, Y.;Am J Cardiol,1982
4. Noninvasive Doppler determination of cardiac output in man. Clinical validation;Huntsman, L.L.; Stewart, D.K.; Barnes, SR, Franklin; SB, Colocousis; JS, Hessel; E.A.;Circulation,1983
5. Comparison of non-invasive pulsed Doppler and Fick measurements of stroke volume in cardiac patients;Loeppky, J.A.; Hoekenga, D.E.; Greene, E.R.; Luft, U.C.;Am HeartJ,1984