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Translated from Fiziko-Tekhnicheskie Problemy Razrabotkii Poleznykh Iskopaemykh, No. 3, pp. 139–140, May–June, 1969.
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Akimochkin, P.V. Conference on Rock Breaking. Soviet Mining Science 5, 366–367 (1969). https://doi.org/10.1007/BF02501883
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DOI: https://doi.org/10.1007/BF02501883