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B. M.  Devassy and Halligudi, S. B., ?Effect of calcination temperature on the catalytic activity of zirconia-supported heteropoly acids?, Journal of Molecular Catalysis A-Chemical, vol. 253, no. 1-2, pp. 8-15, 2006.\par \par D. P.  Sawant, Hartmann, M., and Halligudi, S. B., ?Effect of pretreatment conditions on the catalytic activity of nano-sized TPA/ZrO2 dispersed in SBA-15 channels in acetylation reactions?, Microporous and Mesoporous Materials, vol. 102, no. 1-3, pp. 223-233, 2007.\par \par D. P.  Sawant, Vinu, A., Lefebvre, F., and Halligudi, S. B., ?Tungstophosphoric acid supported over zirconia in mesoporous channels of MCM-41 as catalyst in veratrole acetylation?, Journal of Molecular Catalysis A-Chemical, vol. 262, no. 1-2, pp. 98-108, 2007.\par \par N. G.  Waghmare, Kasinathan, P., Amrute, A. P., Lucas, N., and Halligudi, S. B., ?Titania supported silicotungstic acid: an efficient solid acid catalyst for veratrole acylation?, Catalysis Communications, vol. 9, no. 10, pp. 2026-2029, 2008.\par \par }