TY  - RPRT
TI  - The relationship between exercise-induced R wave amplitude changes and QRS vector loops.
AU  - K Watanabe
AU  - V Bhargava
AU  - V F Froelicher
PY  - 1981
DO  - 10.1016/s0022-0736(81)80047-7
UR  - https://pubmed.ncbi.nlm.nih.gov/7276781/
ID  - 7276781
ER  -