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.

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.