Razgonov, O. P., O. V. Adreevskykh, B. M. Bondarenko, and D. O. Bezrukavyi. “TO ESTIMATE THE FRICTIONAL FORCES AT THE POINTS OF START AND STOP OF THE ARMATURE OF THE RELAY”. Science and Transport Progress, no. 14, Feb. 2007, pp. 12-15, doi:10.15802/stp2007/17759.