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P.  Kalita, Gupta, N. M., and Kumar, R., ?Synergistic role of acid sites in the Ce-enhanced activity of mesoporous Ce-Al-MCM-41 catalysts in alkylation reactions: FTIR and TPD-ammonia studies?, Journal of Catalysis, vol. 245, no. 2, pp. 338-347, 2007.\par \par U. S.  Taralkar, Kalita, P., Kumar, R., and Joshi, P. N., ?Synthesis, characterization and catalytic performance of Sn-MCM-48 in solvent-free Mukaiyama-type aldol condensation reactions?, Applied Catalysis A-General, vol. 358, no. 1, pp. 88-94, 2009.\par \par P.  Kalita, Gupta, N. M., and Kumar, R., ?Solvent-free mukaiyama-aldol condensation catalyzed by Ce-Al-MCM-41 mesoporous materials?, Microporous and Mesoporous Materials, vol. 144, no. 1-3, pp. 82-90, 2011.\par \par P.  Kalita and Kumar, R., ?Solvent-free coumarin synthesis via pechmann reaction using solid catalysts?, Microporous and Mesoporous Materials, vol. 149, no. 1, pp. 1-9, 2012.\par \par }