共 6 条
[3]
FISHBURNE JI, 1974, FERTIL STERIL, V25, P762
[4]
FLEISS JL, 1973, STATISTICAL METHODS, P43
[5]
HULKA J, 1977, 3RD INT C GYN END SA
[6]
PEELAND PC, 1976, OBSTET GYNECOL, V47, P501