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3. Cobbs, B. W., Jr., Logue, R. B., and Dorney, E. R.. The heart sounds in pulmonary embolism and pulmonary hypertension, a phonocardiographic study. To be published.
4. Splitting of the first and second heart sounds;Leatham;Lancet,1954
5. The splitting of the second heart sound in normal subjects and in patients with congenital heart disease;Aygen;Circulation,1962