1. 1A. J. Gesing, E. L. Cambridge, J. McIntyre, M. Vandermeulen, and C. J. Rogers , "Electrolytic Reduction Cells," Euro. Pat. No. 68782, 1983 .
2. 2Y. Bertaud "Cell for the Electrochemical Production of a Metal from its Halide." French Pat. No. 2506789, 1982 .