TY  - RPRT
TI  - A simple linear pulse-to-pulse cardiac tachometer.
AU  - O Z Roy
AU  - R W Wehnert
PY  - 1974
DO  - 10.1007/bf02477810
UR  - https://pubmed.ncbi.nlm.nih.gov/4466996/
ID  - 4466996
ER  -