1. 1. T. Suzuki, K. Saito, S. Nakashizu, and O. Iwamoto, US Patent 6,924,316 (2005).
2. 2. T. Suzuki, Petrotec, 25, 590 (2002).
3. 3. K. Aika, Kagaku to Kyoiku (Chemistry and Education), 42, 680 (1994).
4. 4. K. Aika, Shokubai (Catalyst and Catalysis), 38, 287 (1996).
5. 5. T. Suzuki, H. Iwanami, and T. Yoshinari, Int. J. Hydrogen Energy, 25, 119 (2000).