TY  - RPRT
TI  - A wide-range linear beat-by-beat cardiotachometer.
AU  - W M Caldwell
AU  - L D Smith
AU  - M F Wilson
PY  - 1970
DO  - 10.1007/bf02509328
UR  - https://pubmed.ncbi.nlm.nih.gov/5484858/
ID  - 5484858
ER  -