Чернець, М., and Ю. Чернець. “Investigation of Teeth Engagement Conditions of Cylindrical Involute Gear on Contact Strength, Wear and Durability. Part 3. Changeable Interaction Conditions in Non-Correlated Engagement”. Problems of Tribology, vol. 74, no. 4, June 2015, pp. 49-54, https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/407.