Гордєєв, О.А., and А.К. Кармаліта. 2014. “ Analysis of Geometrical Parameters and Picture Profile Mastyloutrymuvalnoho of the Fluid in a Spherical Hole on Sliding Surface”. Problems of Tribology 69 (3):59-66. https://tribology.khnu.km.ua/index.php/ProbTrib/article/view/166.