共 28 条
[21]
KIKUCHI Y, 1957, J ACOUST SOC AM, V29, P824
[22]
LEKSELL L, 1956, Acta Chir Scand, V110, P301
[23]
MACVICAR J, 1963, J OBSTET GYN BR COMM, V70, P387
[25]
SUNDEN B, 1964, ACTA OBSTETRICA G S6, V43
[28]
WILLOCKS J, 1964, J OBSTET GYNAECOL, V71, P111