S. B.  Halligudi, ?Tungstophosphoric acid and zirconia supported on mesoporous silica catalyst in veratrole acetylation?, in From ZEOLITES to Porous Mof Materials: The 40th Anniversary of International ZEOLITE Conference, Proceedings of The 15th International ZEOLITE Conference, Sara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, Netherlands, 2007, vol. 170, pp. 1325-1330.