共 8 条
[3]
BROCK DJH, 1976, LANCET, V2, P345
[4]
NYBERG DA, 1984, J ULTRAS MED, V3, P29
[5]
AMNIOTIC-FLUID ACETYLCHOLINESTERASE AND PRENATAL-DIAGNOSIS
[J].
BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY,
1980, 87 (06)
:501-505
[7]
SMITH AD, 1979, LANCET, V1, P685
[8]
WARD AM, 1974, LANCET, V2, P345