Literature cited
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Additional information
Leningrad “Krasnogvardeets” Production Association. Translated from Meditsinskaya Tekhnika, No. 1, pp. 19–25, January–February, 1969.
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Blashkin, I.I. Problems of direct recording in phonocardiography. Biomed Eng 3, 16–20 (1969). https://doi.org/10.1007/BF00557628
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DOI: https://doi.org/10.1007/BF00557628