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Hirsimäki, H., Kero, P., Seppälä, T. et al. Mean or maximum velocity using pulsed dopper ultrasound in determination of doppler-derived cardiac output in the newborn infant. Med. Biol. Eng. Comput. 31, 58–60 (1993). https://doi.org/10.1007/BF02446894
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DOI: https://doi.org/10.1007/BF02446894