1. Herzberg, G.: Molecular Spectra and Molecular Structure, New York: van Nostrand Reinhold, 1950.
2. King, D.A., Wells, M.G.: Surf. Sci. 29 (1972) 454.
3. Ku, R., Gjostein, N.A., Bonzel, H.P.: Proc. Symp. Catalytic Chemistry of Nitrogen Oxides, 1974.
4. Bridge, M.E., Marbrow, R.A., Lambert, R.M.: Surf. Sci. 57 (1976) 415.
5. Brodén, G., Rhodin, T.N., Brucker, C., Benbow, R., Hurych, Z.: Surf. Sci. 59 (1976) 593.