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Literature Cited
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 22–25, November–December, 1972.
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Ardashev, K.A., Shik, V.M. Effect of the working depth on the span and fracture pattern of the roof. Soviet Mining Science 8, 618–620 (1972). https://doi.org/10.1007/BF02497581
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DOI: https://doi.org/10.1007/BF02497581