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Petrovsk Dnepropetrovsk Metallurgical Plant. Translated from Metallurg, No. 3, pp. 30–32, March, 1978.
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Andreev, V.I., Derevyanko, V.I., Beda, N.I. et al. Spark surface hardening of parts. Metallurgist 22, 182–185 (1978). https://doi.org/10.1007/BF00734774
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DOI: https://doi.org/10.1007/BF00734774