1. B. Delmon, M. Houalla, in “Preparation of Catalysts”,Delmon et al. (ed.), Elsevier, Amsterdam, 1979; p. 439.
2. V. B. Fenelonov, A. V. Neimark, L. I. Kheifets, A. A. Samakhov Ibid “; p. 233.
3. G. H. Van den Berg, H. Th. Rijnten, Ibid “; p. 265.
4. J. Cervello, E. Hermana, J. M. Jimenez, F. Melo, in “Preparation of Catalysts”,Delmon et al. (ed.), Elsevier, Amsterdam, 1976; p. 251.
5. G. K. Boreskov, ibid. “; p. 223.