1	V. A. Tyagai, Electrochimica Acta 16, (1971) p. 1647
2	U. Bertocci, R. W. Shideler, Falls Meeting October 1987, Abstract 127
3	R. Dölling, Dissertation, Clausthal 1984
4	K. Nachstedt, Dissertation, Clausthal 1990
5	Patent DE 37 80 633 T3

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