Сорокатий, Р., М. Диха, and С. Посонський. “The Tense Superficial State of the Discretely Fixed Surfaces of Friction”. Problems of Tribology, vol. 76, no. 2, June 2015, pp. 57-60, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/428.