共 20 条
[1]
Alverson D C, 1984, Am J Perinatol, V1, P148, DOI 10.1055/s-2007-999991
[4]
ALVERSON DC, 1983, PULSED DOPPLER ULTRA, P173
[6]
FRIEDMAN MJ, 1980, CIRCULATION, V62, P101
[10]
Hatle L, 1982, DOPPLER ULTRASOUND C, P192