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S.  Selvakumar, Chidambaram, M., and Singh, A. P., ?Benzylsulfonic acid functionalized mesoporous Zr-TMS catalysts: an efficient and recyclable catalyst for the preparation of coumarin derivatives by pechmann condensation reaction?, Catalysis Communications, vol. 8, no. 5, pp. 777-783, 2007.\par \par S.  Shylesh, Srilakshini, C., Singh, A. P., and Anderson, B. G., ?Bridging the gap between micropores and mesopores by the controlled transformation of bifunctional periodic mesoporous silicas?, Microporous and Mesoporous Materials, vol. 108, no. 1-3, pp. 29-40, 2008.\par \par S.  Selvakumar and Singh, A. P., ?Benzoylation of anisole over silicotungstic acid modified mesoporous alumina?, Catalysis Letters, vol. 128, no. 3-4, pp. 363-372, 2009.\par \par P.  Sharma and Singh, A. P., ?Binapthyl Schiff base diamine complex covalently bonded to modified SBA-15: synthesis, characterization and catalytic application?, Catalysis Today, vol. 198, no. 1, pp. 184-188, 2012.\par \par }