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Literature cited
M. T. Gusman et al., Screw-Type Downhole Motors for Well Drilling [in Russian], Nedra, Moscow (1981).
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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 12, pp. 10–11, December, 1989.
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Korotaev, Y.A., Tsepkov, A.V. & Kochnev, A.M. Calculation of principal geometric parameters for multithread helicoidal rotor mechanism of screw-type downhole motor. Chem Petrol Eng 25, 678–681 (1989). https://doi.org/10.1007/BF01147852
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DOI: https://doi.org/10.1007/BF01147852