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Translated from Fiziko-Technicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 109–111, September–October, 1969.
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Posokhov, G.E., Cheremnov, V.I., Noskov, V.F. et al. Deformation of coal pillars during overworking. Soviet Mining Science 5, 587–592 (1969). https://doi.org/10.1007/BF02501282
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DOI: https://doi.org/10.1007/BF02501282