1. K. H. Schmidt, Chem. Ind. 35: 69 (1983)
2. H. Kral, Chem. Ind. 41:44 (1989).
3. H. P. Boehm and H. Knözinger, In: “Catalysis-Science and Technology”, J. R. Anderson and M. Boudart, eds., Springer, Berlin, Heidelberg, New York, Vol. 4, p. 39, 1983.
4. H. H. Lamb, B. C. Gates and H. Knözinger, Angew. Chem. Int. Ed. Enal. 27: 1127 (1988).
5. E. Garrone and F. S. Stone, Proc. 8th Intern. Congr. Catal., Berlin, 1984, Vol. 3: 441 (1984).