DOWNHOLE PRESSURE CONTROL METHOD BASED ON CONTROL THEORY WITH PREDICTION MODELS AND SYSTEM THEORY von JAN BO, TAN GOTSZJUN, TSZO SIN, KHAN' LESJAN, TAN GUJ, VEHJ TSJAN, SJAO ZHUN'DEH, LI CHZHILIN, SJUEH TSJULAJ, DUN BIN, SUN' KHAJFAN

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