1. K, Arata, M, Hino, 1988, Proceedings, 9th International Congress on Catalysis, Calgary, 1988, 4, 1727, Chem. Institute of Canada, Ottawa
2. Influence of ZrO2 Crystalline Structure and Sulfate Ion Concentration on the Catalytic Activity of So2−4- ZrO2
3. Promotion of zirconia acidity by addition of sulfate ion
4. H, P, Boehm, H, Knozinger, 1983. Catalysis Science and Technology, J, R, AndersonM, Boudart, 4, 39, Springer-Verlag, Berlin