1. P. Nascimento, C. Akrotopoulou, M. Oszagyan, G. Coudurier, C. Travers, J.F. Joly and J.C. Vedrine, 10th Int. Congr. Catalysis (Budapest, July 1992) c
2. C. Morterra, G. Cerrato, C. Emanuel and V. Bolis, 10th Int. Congr. Catalysis (Budapest, July 1992) contr. P297.
3. On the strength of solid acids
4. Mechanism of acidity generation on sulfur-promoted metal oxides