1. C. L. Lopez-Cacicedo,J. Separ. Proc. Technol. 2, (1981), 34.
2. Marketed by BEWT (Water Engineers) Ltd, Tything Road, Arden Forest Industrial Estate, Alcester, Warwickshire, England.
3. G. Kreysa and C. Reynvaan,J. Appl. Electrochem. 12, (1982) 241.
4. Marketed by Deutsche Carbone Akt., Post 560 209, Talstrasse 112, 6000 Frankfurt/Main, West Germany.
5. M. G. Konicek and G. Platek,New Materials and New Processes 2 (1983) 232.