Mendebaev, T.N., Smashov, N.Z., Ismailov, H.K. and Izakov, B.K. 2019. Development of a resource-saving, small-sized downhole hydraulic machine for well drilling. Eastern-European Journal of Enterprise Technologies. 6, 1 (102) (Nov. 2019), 70–76. DOI:https://doi.org/10.15587/1729-4061.2019.184939.