TY  - RPRT
TI  - Instant electrocardiography. Use in cardiac exercise programs.
AU  - J D Cantwell
AU  - G F Fletcher
PY  - 1974
DO  - 10.1161/01.cir.50.5.962
UR  - https://pubmed.ncbi.nlm.nih.gov/4430100/
ID  - 4430100
ER  -