1. Preparation of superacids by metal oxides for reactions of butanes and pentanes
2. Solid Superacids
3. K. Matsuzawa, Patent WO9703092 (1997), to Japan Energy Corporation.
4. H. Matsuhashi, M. Hino, K. Arata, in: K. Tanabe, H. Hattori, T. Yamaguchi, T. Tanaka (Eds.), Acid–Base Catalysis, Kodansha, Tokyo, 1989, p. 357.
5. Solid catalyst treated with anion