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All-Union Scientific-Research Institute of Labor Protection and Safety Techniques, Chelyabinsk. Translated from Metallurg, No. 8, pp. 36–38, August, 1974.
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Shapiro, A.S. Individual protection from noise. Metallurgist 18, 625–627 (1974). https://doi.org/10.1007/BF01088914
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DOI: https://doi.org/10.1007/BF01088914