TY  - RPRT
TI  - A practical stethoscope approximator.
AU  - W R Ploss
AU  - R E Ploss
PY  - 1969
DO  - 10.1097/00000542-196903000-00024
UR  - https://pubmed.ncbi.nlm.nih.gov/5778105/
ID  - 5778105
ER  -