Literature cited
K. Kholl'dak and D. Vol'f, Atlas and Handbook for Phonocardiography and Related Mechanocardiographic Methods of Study [in Russian], Moscow (1964).
L. M. Fitileva, Clinical Phonocardiography [in Russian], Second edition, Moscow (1964).
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Additional information
Leningrad Red Guard Production Association. Translated from Meditsinskaya Tekhnika, No. 1, pp. 20–22, January–February, 1979.
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Blashkin, I.I., Gerchikov, L.P. Instruments of the “Fonokard” type for phonocardiographic studies. Biomed Eng 13, 15–17 (1979). https://doi.org/10.1007/BF00557426
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DOI: https://doi.org/10.1007/BF00557426