共 9 条
[2]
CHANG CC, 1970, FERTIL STERIL, V21, P274
[3]
NEWTON J, 1972, LANCET, V2, P951
[4]
SOBRERO AJ, 1970, OBSTET GYNECOL, V36, P911
[5]
INTRAUTERINE DEVICES IN CLINICAL PRACTICE
[J].
FAMILY PLANNING PERSPECTIVES,
1971, 3 (01)
:16-24
[8]
ZIPPER J, 1969, AM J OBSTET GYNECOL, V105, P529