Венцель, Є., and А. Кравець. “Ventsel’ Е.S., Kravets’ A.M. Мathematical Model of Tribocoupling”. Problems of Tribology, vol. 83, no. 1, Mar. 2017, pp. 112-8, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/587.