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INFLUENCE OF COAL ROCK HARDNESS AND CONFINING PRESSURE ON SPECIFIC ENERGY CONSUMPTION OF PDC BIT DURING GAS EXTRACTION BOREHOLE. GJAETS [Internet]. 2017 Aug. 11 [cited 2024 Nov. 25];4(8):1-7. Available from: https://gjaets.com/index.php/gjaets/article/view/163