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12. [The physiologic 3d heart sound in childhood. Determination in phonocardiography and assessment by auscultation]. Schwartze D. Cor Vasa; 1987 May; 29(4):285-92. PubMed ID: 3677717 [Abstract] [Full Text] [Related]
13. [Heart sounds in the polygraphic evaluation of the phases of the cardiac cycle. Critical review. IV. The 3d sound]. Castelli E, Cocco G, Bonavita E. Arch Patol Clin Med; 1967 May; 44():422-32. PubMed ID: 4921939 [No Abstract] [Full Text] [Related]