TY  - RPRT
TI  - Vectorcardiogram past forty.
AU  - A C Witham
AU  - J E Lahman
PY  - 1970
DO  - 10.1016/0002-8703(70)90303-0
UR  - https://pubmed.ncbi.nlm.nih.gov/4243724/
ID  - 4243724
ER  -