1. Usynin, Yu.S., Sistemy upravleniya elektroprivodov (The Control Systems of Electric Drives), Chelyabinsk: Yuzh.-Ural. Gos. Univ., 2004.
2. Belykh, I.A., Grigor’ev, M.A., and Belousov, E.V., An electrical feed drive-control system for a cold reducing mill, Russ. Electr. Eng., 2018, vol. 88, no. 4.
3. Feofilov, S.V., Periodic movements in digital relay control systems, Mekhatronika, Avtom., Upr., 2006, no. 11.
4. Faldin, N.V. and Morzhov, A.V., Self-oscillations in relay systems with piecewise linear control objects, Mekhatronika, Avtom., Upr., 2007, no. 2.