[Origin of the apical beat and significance of systolic changes in the apexcardiogram].

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@article{Gleichmann1971OriginOT, title={[Origin of the apical beat and significance of systolic changes in the apexcardiogram].}, author={Ulrich Gleichmann and Nicholas Vlachakis and T Tsilos}, journal={Zeitschrift fur Kreislaufforschung}, year={1971}, volume={60 9}, pages={789-807} }