共 19 条
[3]
CHIK L, 1981, METHOD INFORM MED, V20, P133
[5]
CRUIKSHANK DP, 1977, OBSTET GYNECOL, V50, P367
[6]
FRIEDMAN EA, 1971, J REPROD MED, V7, P176
[7]
Friedman EA, 1978, LABOR CLIN EVALUATIO, V2nd
[9]
HOBEL CJ, 1973, AM J OBSTET GYNECOL, V117, P1