TY  - RPRT
TI  - Electrocardiographic cancellation: mathematical basis.
AU  - R A HELM
PY  - 1960
DO  - 10.1016/0002-8703(60)90101-0
UR  - https://pubmed.ncbi.nlm.nih.gov/14400924/
ID  - 14400924
ER  -