共 18 条
[1]
BUTTERWORTH JS, 1960, CARDIAC AUSCULATION, P50
[4]
ERTEL PY, IN PREPARATION
[5]
FABER JJ, 1962, CIRC RES, V11, P96
[6]
FLETCHER H, 1953, SPEECH HEARING COMMU, P145
[7]
The stethophone, an electrical stethoscope
[J].
BELL SYSTEM TECHNICAL JOURNAL,
1924, 3 (04)
:531-549
[8]
GROOM D, 1957, Postgrad Med, V22, P360
[9]
GROOM D, 1956, Exp Med Surg, V14, P239