1. W. Herrmann and G. Propstl,Z. Elektrochem 61 (1957) 1154.
2. J. L. Dawson, M. I. Gillibrand and J. Wilkinson, in ?Power Sources?, Vol. 3 (edited by D. H. Collins) Oriel, Oxford (1970) p. 1.
3. A. A. Jenkins and W. C. Maskell,J. Power Sources,16 (1985) 171.
4. J. A. Lee, W. C. Maskell and F. L. Tye, in ?Membrane Separation Processes? (edited by P. Meares), Elsevier, Amsterdam (1975) p. 399.
5. R. G. Robinson and D. L. Walker, in ?Batteries? (edited by D. H. Collins), Pergamon Press. Oxford (1963) 15.