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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 24–28, July–August, 1970.
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Kuznetsov, S.T., Krotov, Y.G. Mechanical characteristics of lower layers of roof rock under static indentation by a punch. Soviet Mining Science 6, 380–383 (1970). https://doi.org/10.1007/BF02508880
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DOI: https://doi.org/10.1007/BF02508880