1. G. Planté, Recherches sur l’Électricité, Gauthier-Villars, Paris, 1883, p. 30.
2. Y. Matsuyama, M. Sasaki, Yuasa-Jiho 87, (1999) 17–21, in Japanese.
3. D.C. Pierce, S. Sasabe, K. Sato, Y. Matsuyama, Proceedings of INTELEC 2000, Phoenix, September 2000, pp. 34–36.
4. Development of a new design of valve-regulated lead–acid battery (new Model YT4B) for motorcycle use
5. Y. Iwaguchi, Y. Kawamoto, N. Yamada, K. Kawakita, S. Tanaka, Yuasa-Jiho 89 (2000) 10–13, in Japanese.