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Determination of cardiac output by an angle and diameter independent dual beam Doppler technique in critically ill infants.Wippermann, C F; Schranz, D; Huth, R; Zepp, F; Oelert, H; Jungst, B K · Heart · 1992
Mean or maximum velocity using pulsed dopper ultrasound in determination of doppler-derived cardiac output in the newborn infantH. Hirsimäki; P. Kero; T. Seppälä; K. Holmström · 1993