Венцель, Є.С., and О.В. Щукін. “Research Friction Surface Grader Blades With Ion-Plasma Coating”. Problems of Tribology 78, no. 4 (February 15, 2016): 64-68. Accessed November 30, 2021. https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/488.