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2. E. W. Justi and A. W. Winsel, Kalte Verbrennung, Franz Steiner Verlag, Weisbaden (1962).
3. B. S. Baker (ed.), Hydrocarbon Fuel Cell Technology, Academic Press, New York (1965).
4. K. R. Williams (ed.), An Introduction to Fuel Cells, Elsevier, New York (1966).
5. H. A. Liebhafsky and E. J. Cairns, Fuel Cells and Fuel Cell Batteries, John Wiley & Sons, New York (1968)