Anew apparatus for recording heart sounds

  • Edward W. Hollingsworth, Lawrence M. Sorensen, Albert Van den Driessche
  • American Heart Journal, August 1937, Elsevier
  • DOI: 10.1016/s0002-8703(37)91319-x

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http://dx.doi.org/10.1016/s0002-8703(37)91319-x