1. Weiss, P., Forrer, R.: Ann. Phys. (Paris)5, 153 (1926)
2. Selwood, P.W.: Chemisorption and magnetization. New York: Academic Press 1975
3. Dalmon, J.A., Martin, G.A.: Proceedings of the 7th International Congress on Catalysis, Tokyo (1980, Part A), p. 402. Amsterdam: Elsevier 1980
4. Sauvion, G.N., Temp�re, J.F., Guilleux, M.F., Delafosse, D.: J. Chim. Phys.81, 133 (1984)
5. Sauvion, G.N., Guilleux, M.F., Temp�re, J.F., Delafosse, D.: Stud. Surf. Sci. Catal.12, 229 (1982)