Чернов, Б.О. et al. 2014. THE INCREASE OF RUST RESISTANCE OF THE DRILLING STRING ELEMENTS BY MEANS OF VACUUM GAS-AND-THERMAL CYCLE AND ION-PLASMA NITRATION B. O. CHERNOV, V. I. MIRNENKO, M. YA. TKACH. Oil and Gas Power Engineering. 2(22) (Nov. 2014), 21–26.