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Additional information
Northern Institute of Mining, Yakutian Branch, Siberian Division, Academy of Sciences of the USSR. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 34–39, September–October, 1987.
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Sleptsov, A.E., Izakson, V.Y. Estimation of the maximum roof span for initial sagging in permafrost ground. Soviet Mining Science 23, 406–411 (1987). https://doi.org/10.1007/BF02506429
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DOI: https://doi.org/10.1007/BF02506429