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Genest, J., Durand, L.G. Relationship of the left ventricular and apical first sounds to the left ventricular pressure derivative. Med. Biol. Eng. Comput. 23, 95–98 (1985). https://doi.org/10.1007/BF02444038
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DOI: https://doi.org/10.1007/BF02444038