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- ALIMURING M. M., RAPPAPORT M. B., SPRAGUE H. B. Variations in the first apical sound simulating the so-called presystolic murmur of mitral stenosis; a phonocardiographic study. N Engl J Med. 1949 Oct 27;241(17):631–636. doi: 10.1056/NEJM194910272411701. [DOI] [PubMed] [Google Scholar]











