共 4 条
[1]
DANFORTH DN, 1982, OBSTET GYNECOL, P482
[2]
HIBBARD BM, 1988, PRINCIPLES OBSTETRIC, P86
[3]
PRITCHARD JA, 1985, WILLIAMS OBSTETRICS, P462
[4]
RUSSELL KL, 1987, OBSTET GYNECOL, P169