TY  - GEN
AU  - Delman,A J
TI  - Importance of proper selection and standardization of phonocardiographic equipment in the diagnosis of aortic ball variance
SN  - 0003-4975
PY  - 1971///0720
KW  - Heart Valve Prosthesis
KW  - Humans
KW  - Phonocardiography
KW  - standards
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1016/s0003-4975(10)65083-7
ER  -