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Translated from Izmeritel'naya Tekhnika, No, 7, pp. 5–7, July, 1974.
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Lopashev, D.Z., Kon'kov, A.V. & Masyukov, V.T. Primary state standard for unit sound pressure in air. Meas Tech 17, 981–984 (1974). https://doi.org/10.1007/BF00811868
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DOI: https://doi.org/10.1007/BF00811868