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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 53–57, November–December, 1980.
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Shmakin, I.G., Romanov, V.A. & Brakker, I.I. Forces in cutting of potassium salts. Soviet Mining Science 16, 551–555 (1980). https://doi.org/10.1007/BF02499429
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DOI: https://doi.org/10.1007/BF02499429