O. Kozyreva, I. Plokhov, Y. N. Guraviev, I. E. Savraev, and A. V. Ilyin, “The regions of parametric instability of brush-contact device electromagnetic circuit in unstable working conditions”, ETR, vol. 1, pp. 84–88, Jun. 2015, doi: 10.17770/etr2015vol1.218.