共 18 条
[1]
Alpert E, 1970, Lancet, V2, P465
[2]
BROWN J B, 1970, Journal of Obstetrics and Gynaecology of the British Commonwealth, V77, P690
[6]
HAMBURGER C, 1944, ACTA OBSTET GYN SCAN, V24, P45
[9]
PURVES LR, 1972, LANCET, V1, P47