Шевеля, В., В. Олександренко, А. Трытек, and Ю. Соколан. “Scratch-Analysis of Subsurface Layers Formation During Friction of Thermal Treated Steel”. Problems of Tribology, vol. 76, no. 2, June 2015, pp. 6-18, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/421.