Umbilical Venous Pressure and Doppler Flow Pattern of Inferior Vena Cava in the Fetus - Okamura, Kunihiro; Murotsuki, Jun; Kobayashi, Masaomi; Yano, Masahiro; Tanigawara, Shingo; Uehara, Shigeki; Yajima, Akira (American Journal of Perinatology, 1994)