TY  - GEN
AU  - McDonald,R D
TI  - A heart rate meter for measurement of instantaneous and average rates
SN  - 0025-696X
PY  - 1967///0619
KW  - Heart Function Tests
KW  - instrumentation
KW  - Heart Rate
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1007/BF02474805
ER  -