1. 1. Intern. Symp. on Scientific Bases for the Preparation of Heterogeneous Catalysts (editors B. Delmon, P. A. Jacobs, and G. Poncelet) Elsevier, Amsterdam 1976.
2. 2. Ph. Courty, Ch. Marcilly, General Synthesis method for mixed oxide catalysts, in ref. 1, 1st Symp., 1976, pp. 119–145.
3. 3. M. W. J. Wolfs, J. H. C. Van Hooff, in ref. 1, 1st Symp., 1976, pp. 161–171.
4. 4. I. C. I. Patent U. S. 3.850.850, 1972.
5. S. Melta, G. W. Simmons, K. Klier, Proceed. 7th Congr. on Catalysis, Tokio, 1980, pp. 475–489.