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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 138–139, May–June, 1969.
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Tsytsarkin, V.N. Seminar on rock pressure and protection of main roadways and development workings in thick and steep seams. Soviet Mining Science 5, 364–365 (1969). https://doi.org/10.1007/BF02501882
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DOI: https://doi.org/10.1007/BF02501882