Мисліборський, В., and С. Костогриз. “. Systematization and Analysis of Factors Effecting Tangential Hardness of Nominal Stationary Friction Contact.”. Problems of Tribology, Vol. 73, no. 3, June 2015, pp. 93-02, http://tribology.khnu.km.ua/index.php/ProbTrib/article/view/399.