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Translated from Metallurg, No. 12, p. 39, December, 1978.
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Nikol'skii, A.S. Development of ferrous metallurgy in Bulgaria. Metallurgist 22, 843–844 (1978). https://doi.org/10.1007/BF00733582
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DOI: https://doi.org/10.1007/BF00733582