共 8 条
[1]
BIRO VS, 1944, MSCHR GEBURTSH GYNAK, V117, P185
[2]
DOUGLAS JWB, 1950, J OBSTET GYN BRIT EM, V57, P143
[3]
MOLLERCHRISTENS.E, 1938, ACTA OBSTET GYN SCAN, V18, P222
[4]
NIXON W C, 1955, Postgrad Med J, V31, P266
[5]
SOUTAR KA, 1958, COMMUNICATION
[7]
Stewart AM, 1955, BRIT J PREV SOC MED, V9, P57
[8]
Stewart A, 1955, BRIT J PREV SOC MED, V9, P159