1. K. Johnson, Mekhanika Kontaktnogo Vzaimodeystviya [Contact Mechanics] (Moscow: Mir: 1989) (Russian translation).
2. G. K. Trubin, Kontaktnaya Ustalost Materialov dlya Zubchatykh Koles [Contact Fatigue of Materials for Gears] (Moscow: Mashgiz: 1962) (in Russian).
3. V. M. Zinchenko, Inzheneriya Poverkhnosti Zubchatykh Koles Metodami Khimiko-Termicheskoy Obrabotki [Engineering of the Surface of Gears by Methods of Chemical Heat Treatment] (Moscow: MGTU im. N. E. Baumana: 2001) (in Russian).
4. Formation of coatings on bearing steel ShKh15 during ion-plasma nitriding and subsequent quenching with tempering
5. P. V. Kaplun and K. A. Parshenko, Pidvyshchennya Znosostiykosti Pidshypnykiv Kochennya [Increase of Wear Resistance of Roller Bearings] (Khmelnytsky: KhNU: 2016) (in Ukrainian).