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- [43] SIGNIFICANCE OF 4TH HEART SOUND AND SPLIT 1ST HEART SOUND - REPLY AMERICAN JOURNAL OF CARDIOLOGY, 1975, 36 (07): : 980 - 980
- [48] THE 1ST HEART-SOUND IN NORMAL AND PATHOLOGICAL CONDITIONS JAPANESE HEART JOURNAL, 1987, 28 (02): : 143 - 156
- [50] PHONOMETRIC STUDY OF THE HUMAN 1ST HEART-SOUND JAPANESE HEART JOURNAL, 1982, 23 (05): : 711 - 716