1. Agency of Environment of Japan, Kankyohakusho (environment report), 1997.
2. M. Iwamoto, H. Furukawa, Y. Mine, S. Mikuriya, and S. Kagawa, J. Chem. Soc. Chem. Comm. 1272 (1986).
3. Ger. Offe. DE 3642018 (1987) (Volkswagen); Japan Kokai 1988–100, 919 (Toyota).
4. W. Held, A. Konig, T. Richter, and L. Ruppe, SAE paper 900496; M. Iwamoto, H. Yashiro, Y. Yu-u, S. Shundo, and N. Mizuno, Shokubai 32, 430 (1990); H. Hamada, Y. Kintaichi, M. Sakai, T. Ito, and M. Tabata, Appl. Catal. 64, L1 (1990); Catal. Lett. 6, 239 (1990).
5. Y. Li and J. Armor, Appl. Catal., B 1, 131 (1992).