Reducing of sparking caused by the parametric modulation of sliding electric contact unit at synchronous machineKozyreva, Oksana; Plokhov, Igor; Kotkov, Nikita; Gevorkov, Levon; Rassõlkin, Anton; Vaimann, Toomas; Kallaste, Ants17th International Symposium “Topical Problems in the Field of Electrical and Power Engineering”. Doctoral school of energy and geotechnology. III : Kuressaare, Estonia, January 15-20, 20182018 / p. 236-239 : ill http://ise.elnet.ee/record=b2950145~S2*est