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3. C. Ernst, The Fixation of Atmospheric Nitrogen, Chapman and Hall, London, 1928; J. B. Allen, Chem. Eng. Progress (Sept 1965) 1; S. Strelzoff and L. C. Pan, Synthetic Ammonia, Chemico, 1962.
4. ICI European Patent Application 78302769 (March 7 1979);
5. Nitrogen (Nov-Dec 1979) 122; S. A. Topham, S. A. Hall, and D. G. Heath, Development of ICI Low Pressure Ammonia Synthesis Catalyst, ICI/CFDC Technical Symposium, Shanghai (April 1989).