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Schwerdt, H., Bette, L., Grillmaier, R. et al. Design and evaluation of a new computer-based force vectorballistocardiograph. Med. Biol. Eng. Comput. 25, 453–458 (1987). https://doi.org/10.1007/BF02443368
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DOI: https://doi.org/10.1007/BF02443368