1. TH. Wolkenstein, Advance in Catalysis,12, 189 (1960).
2. T. Kawakami, Japanese Patent Gazette, S50-56296 (May. 16, 1975).
3. M. Nitta, S. Kanefusa and M. Haradome, J. Electrochem. Soc,125, 1676 (1978).
4. N. Taguchi, Japanese Patent Gazette, S47-38840 (Sep. 30, 1972).
5. J. Robert, Japanese Patent Gazette, S51-69688 (Jun. 16, 1976).