1. R. Schlogl, in: J.R. Jennings, Catalytic Ammonia Synthesis: Fundamental and Practice, Plenum, New York, (1991).
2. XPS studies with ammonia synthesis catalysts
3. B.S. Clausen, S. Morup, H. Topsoe, R. Candia, E.J. Jensen, A. Barański, A. Pattek, J. Phys. Colloq. (1979) 245.
4. Structural study of the Al2O3-promoted ammonia synthesis catalyst I. Unreduced state
5. P. Stoltze, in: K. Aika, et al. Ammonia Catalysis and Manufacture, Springer-Verlag, Berlin, Heidelberg (1995).