1. M.V. Tovbin, V.Ya. Zabuga, V.K. Yatsimirskii: Catalytic Properties of Alloys in Ammonium Synthesis, University, Kiev 1973.
2. V.V. Nemoshkalenko, V.G. Aleshin: Electron Spectroscopy of Crystals. Naukova Dumka, Kiev 1976.
3. J.H. Scofield: J. Electron Spectrosc. Relat. Phenom.,8, 123 (1976).
4. G. Daglish, D.D. Eley: Actes 2 éme Congr. Intern. Catalyse. Paris, Vol. 2, p. 1615, Paris 1961.
5. A.A. Zhukhovitskii: Zh. Fiz. Khim. 18, 214 (1944).