共 9 条
[2]
DELEE JB, 1947, PRINCIPLES PRACTICE
[3]
GREENHILL JP, 1947, YB OBSTETRICS GYNECO, P104
[4]
GREIG DS, 1943, J OBSTET GYN BR EMP, V50, P337
[5]
HAYES WI, 1946, AM J OBST G, V51, P442
[6]
King AG, 1940, J AMER MED ASSOC, V114, P238