共 16 条
[1]
BALL M, 1976, European Journal of Obstetrics and Gynecology and Reproductive Biology, V6, P63, DOI 10.1016/0028-2243(76)90004-6
[2]
Billings John J., 1973, NATURAL FAMILY PLANN
[3]
Guerrero R, 1970, Rev Colomb Obstet Ginecol, V21, P545
[4]
GUERRERO R, 1971, REV COL OBSTET GYNEC, V22, P13
[6]
KLAUS H, 1977, FERTIL STERIL, V28, P1038
[7]
KNAUS HERMANN, 1933, ZENTRALBL GYNAKOL, V57, P1393
[8]
MARSHALL, 1976, LANCET, V2, P282
[9]
OGINO K, 1930, ZENTRALBL GYNAEKOLOG, V58, P464
[10]
POTTER RG, 1968, HDB SERVICE STATISTI