1. Vol’dek, A.I., Elektricheskie mashiny (Electrical Machines), Leningrad: Energiya, 1974.
2. Geller, B. and Gamata, V., Vysshie garmoniki v asinkhronnykh mashinakh (Higher Harmonics in Induction Machines), Moscow: Energiya, 1981.
3. Khrushchev, V.V., Elektricheskie mashiny sistem avtomatiki (Electrical Machines for Automation Systems), Leningrad: Energoatomizdat, 1985.
4. Gashimov, M.A., Mirzoeva, S.M., and Ramazanov, N.K., Electrical machines eccentricity diagnostic during exploitation, Elektrichestvo, 2005, no. 6.
5. Gashimov, M.A. and Mirzoeva, S.M., Electromagnetic processes diagnostics in electrical machines under air gap irregularity, Elektrichestvo, 2002, no. 11.