For citations:

Oshibkov A.V., Dvoinikov M.V., Frolov S.A., Svetashov V.N., Pan’Kov V.N., Khlopotov P.A. POSSIBILITIES TO EXTEND THE LIFETIME OF SCREW DOWNHOLE MOTOR ROTORS SURFACE LAYER. Oil and Gas Studies. 2016;(2):72-78. (In Russ.) https://doi.org/10.31660/0445-0108-2016-2-72-78