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Institute of Applied Mathematics and Mechanics, Academy of Sciences of the Ukrainian SSR, Donetsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 23–27, May–June, 1974.
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Khapilova, N.S. Estimate of the length of the plastic zone at the face of a coal seam being worked. Soviet Mining Science 10, 272–276 (1974). https://doi.org/10.1007/BF02509464
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DOI: https://doi.org/10.1007/BF02509464