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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 43–48, July–August, 1970.
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Lavtsevich, V.P. Predicting dangerous methane concentrations. Soviet Mining Science 6, 396–399 (1970). https://doi.org/10.1007/BF02508884
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DOI: https://doi.org/10.1007/BF02508884