A statistical comparison of normal ballistocardiograms recorded with a high-frequency table and with various instruments which record body motion directly.

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@article{Helm1953ASC, title={A statistical comparison of normal ballistocardiograms recorded with a high-frequency table and with various instruments which record body motion directly.}, author={Robert A. Helm and A. Iglauer}, journal={American heart journal}, year={1953}, volume={46 3}, pages={321-8} }