TY  - RPRT
TI  - Real-time two-dimensional echocardiography.
AU  - D J Sahn
PY  - 1981
DO  - 10.1016/s0022-3476(81)80446-5
UR  - https://pubmed.ncbi.nlm.nih.gov/7019403/
ID  - 7019403
ER  -