TY  - RPRT
TI  - Upright exercise echocardiography.
AU  - K W Amon
AU  - M H Crawford
PY  - 1979
DO  - 10.1002/jcu.1870070510
UR  - https://pubmed.ncbi.nlm.nih.gov/114544/
ID  - 114544
ER  -