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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 27–33, September–October, 1969.
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Efremov, É.I., Petryashin, L.F. Calculation of the optimal delay in nonsimultaneous firing of borehole charges. Soviet Mining Science 5, 512–517 (1969). https://doi.org/10.1007/BF02501267
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DOI: https://doi.org/10.1007/BF02501267