Popov M. V. Reduction of friction by normal oscillations. I. Influence of contact stiffness / M. V. Popov, V. L. Popov, N. V. Popov // Friction. 2017. Vol. 5, № 1. P. 45-55. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000587224