1. (2) M. Nakamura and A. Imayanagita: “Bearing Corrosion of Induction Motors”, Toyo Denki Review, No. 105, pp. 23-32 (2000-3) (in Japanese)
2. (3) T. Watanabe and M. Imai: “Current-Voltage Characteristics and Electrolytic Corrosion of Traction Motor Bearings”, IEE Japan. IAS Annual Meeting, pp. 23-28 (1988-8) (in Japanese)
3. 渡邊朝紀·今井正行:「電気車用主電動機軸受の通電特性と電食」, 電気学会産業応用部門全大, pp. 23-28 (1988-8)