共 11 条
[1]
ANDOLSEK L, 1972, FAMILY PLANNING RESE, P55
[2]
FLEISS JL, 1973, STATISTICAL METHODS
[3]
GOLDSMITH A, 1972, FAMILY PLANNING RESE, P59
[6]
MISHELL D R JR, 1969, Clinical Obstetrics and Gynecology, V12, P179, DOI 10.1097/00003081-196903000-00010
[10]
TIETZE C, 1970, STUD FAMILY PLANN, V1, P1