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For citation: Tran D., Drebenstedt C. EFFECT OF HOLE SHAPE ON ROUGHNESS FRICTION FACTOR IN PERFORAT-ED AND SLOTTED HORIZONTAL BOREHOLES USED FOR OPENCAST MINE DEWATERING. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2018;(2):9-13. https://doi.org/10.17073/2500-0632-2018-2-9-12

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