1. Bond, G. C.: Catalysis by Metals, p. 155. New York: Academic Press 1962
2. Dowden, D. A., Mackenzie, N., Trapnell, B. M. W.: Advan. Catalysis Relat. Subj. 9, 65 (1957)
3. Halpern, J.: Accounts Chem. Res. 3, 386 (1970)
4. Boudart, M., Delbouille, A., Derouane, E. G., Indovina, V., Walters, A. B.: J. Chem. Soc. 94, 6622 (1972)
5. Derouane, E. G., Indovina, V., Walters, A. B., Boudart, M. in: Reactivity of solids, Proc. VIIth Intern. Symp., Bristol, 1972, p. 703. London: Chapman and Hall 1972