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Additional information
Gidrouglegormash, Karaganda. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 59–63, March–April, 1986.
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Palev, P.P., Puzyr'kov, M.K. Probabilistic method of determing the productivity of screw-type boring units. Soviet Mining Science 22, 131–134 (1986). https://doi.org/10.1007/BF02500803
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DOI: https://doi.org/10.1007/BF02500803