1. Kanigaito O, Doi H, Fujitani Y, Kandori T, Sano K (1975) Catalyst support for high temperature use. AP JP 50009589719750131 Showa
2. Ford Motor Co Ltd UK (1976) Catalytic converter and method for making it. AP GB 1426216 19760225
3. Vanchurin VI, Semenov GM, Amelin AG, Nalivka GD, Kosolapova MM, Kislyi PS (1982) Catalyst for oxidation of sulphur dioxide. AP SU 925380 A1 19620507
4. Tanaka S, Kurimoto IIT, Nakanishi Y (1987) Catalyst for preparation of pyromellitic acid or anhydride. AP JP 62027043 A 9870205 Showa
5. Lednor PW (1992) Catal Today 15:243–261