1. K. Arata, H. Matsuhashi, Solid Superacids (Nove Science Publishers; New York, 2011).
2. K. Arata, in: Preparation of Superacidic Metal Oxides and Their Catalytic Action, Metal Oxide Catalysis, Vol. 2, eds. S.D. Jackson and J.S.J. Hargreaves (Wiley-VCH, Weinheim, 2009) ch. 17.
3. Solid Superacids;Arata K;Adv Catal,1990
4. Sulfated Zirconia-Based Strong Solid-Acid Catalysts: Recent Progress;Song X;Catal Rev,1996
5. Effect of Sulfation Using Sulfate Salt Impregnation Method on Acidity of Cobalt Oxide;Matsuhashi H;J Jpn Petro Inst,2013