1. 1)M. Miyasaka, Zairyo-to-Kankyo, 47, 164 (1998).
2. 3)K. Kinoshita, K. Ichikawa and N. Kitajima, Boshoku-Gijutsu (Presently Zairyo-to-Kankyo), 32, 31 (1983).
3. 4)K. D. Efirld, Corrosion, 33, 3 (1977).
4. 5)http://www.meti.go.jp/report/data/g50330cj.html
5. 8)Von W. Kastner und K. Riedle, VGB KRAFTWERKSTECHNIK, 66 [12] 1171 (1986).