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3. The left sided components of the first heart sound;Lakier, J.B.; Fritz, V.U.; Pocock, W.A.; Barlow, J.B.;South African Journal of Medical Sciences,1970
4. Mitral components of the first heart sound;Lakier, J.B.; Fritz, V.U.; Pocock, W.A.; Barlow, J.B.;British Heart Journal,1972
5. The Heart Sounds in Normal and Pathological Conditions;Orias, O.; Braun Menendez, E.,1939