1. H. Gmelin, ?Handbuch der Anorganischen Chemie?, Verlag Chemie GmbH, Weinheim (1960) Vol. 3 p. 984.
2. D. Wabner, H. P. Fritz and R. Huß,Chem. Ing. Tech. 49 (1977) 329.
3. H. P. Fritz, J. C. G. Thanos and D. Wabner,Z. Naturforsch. 34b (1979) 1017.
4. P. C. Foller and C. W. Tobias, Extended Abstract No. 628, Electrochemical Society Meeting, Florida, October 1980.
5. E. I. Lash, R. D. Hornbeck, G. L. Putman and E. D. Boelter,J. Electrochem. Soc. 98, (1951) 134.