TY  - RPRT
TI  - A cardiotachometer which calculates rate digitally.
AU  - V Elings
AU  - D Holly
PY  - 1973
DO  - 10.1109/tbme.1973.324222
UR  - https://pubmed.ncbi.nlm.nih.gov/4754321/
ID  - 4754321
ER  -