共 24 条
[1]
BATSON HC, 1957, INTRO STATISTICS MED
[3]
Clayton SG, 1941, BJOG-INT J OBSTET GY, V48, P450
[4]
CLIFFORD S H, 1957, Adv Pediatr, V9, P13
[5]
DAICHMAN I, 1954, AM J OBSTET GYNECOL, V68, P1129
[6]
EASTMAN NJ, 1956, WILLIAMS OBSTETRICS, P1067
[9]
HIGGINS LG, 1956, J OBSTET GYNAECOL, V63, P567
[10]
HILL G, 1952, J OBSTET GYN BRIT EM, V59, P807