TY  - RPRT
TI  - ELECTROCARDIOGRAPHIC LEADS.
AU  - R A HELM
AU  - T C CHOU
PY  - 1964
DO  - 10.1016/0002-9149(64)90074-8
UR  - https://pubmed.ncbi.nlm.nih.gov/14206177/
ID  - 14206177
ER  -