共 20 条
[2]
GIBBS RS, 1978, OBSTET GYNECOL, V52, P193
[4]
GOPLERUD CP, 1965, OBSTET GYNECOL, V25, P227
[6]
GREEN SL, 1977, OBSTET GYNECOL, V49, P686
[7]
HAGEN D, 1975, OBSTET GYNECOL, V46, P260
[9]
IFFY L, 1979, OBSTET GYNECOL, V54, P403