共 5 条
[1]
BISHOP EH, 1964, OBSTET GYNECOL, V24, P266
[2]
CALDER AA, 1979, HUMAN PARTURITION, P201
[4]
SONAR MEASUREMENT OF FETAL CROWN-RUMP LENGTH AS MEANS OF ASSESSING MATURITY IN FIRST TRIMESTER OF PREGNANCY
[J].
BMJ-BRITISH MEDICAL JOURNAL,
1973, 4 (5883)
:28-31