TY  - RPRT
TI  - Ballistocardiographic waveform - some contributing factors.
AU  - Graybiel, A.
AU  - Jackson, D. H.
AU  - Mitchell, R. E.
AU  - Oberman, A.
PY  - 1967
UR  - https://ntrs.nasa.gov/citations/19680094720
ID  - 19680094720
ER  -