共 8 条
[1]
BAXI PC, 1957, J OBSTET GYNAECOL, V8, P26
[2]
GUTTMACHER AF, 1952, FERTIL STERIL, V3, P281
[3]
HYRENIUS H, 1958, POPULATION STUDIES, V12, P128
[4]
PERRIN EB, 1963, HUMAN REPRODUCTION S
[5]
POTTER RG, IN PRESS EUGENICS Q
[6]
SMITH TE, 1960, POP STUD-J DEMOG, V14, P113
[7]
TIETZE C, EFFECT BREASTFEEDING, P2
[8]
VINCENT P, 1961, I NATIONAL ETUDES DE, V37, P262