共 13 条
- [1] COHEN MR, 1970, FERTIL STERIL, V21, P715
- [2] ELMAHGOUB S, 1982, CONTRACEPTION, V25, P357, DOI 10.1016/0010-7824(82)90093-2
- [3] INTRACERVICAL RELEASE OF LEVONORGESTREL FOR CONTRACEPTION [J]. CONTRACEPTION, 1981, 23 (05) : 473 - 485
- [6] LAHTEENMAKI P, 1985, INTRAUTERINE CONTRAC, P238
- [8] NILSSON CG, 1978, FERTIL STERIL, V29, P397
- [9] NILSSON CG, 1981, LANCET, P577