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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.  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 S.  Selvakumar, Gupta, N. M., and Singh, A. P., ?Nature of the acid sites in the metal triflates immobilized in SBA-15 and their role in the friedel-crafts acylation of naphthalene?, Applied Catalysis A-General, vol. 372, no. 2, pp. 130-137, 2010.\par \par P. S.  Vijayakumar, Selvakumar, S., Gholap, R. S., Singh, A. P., and Prasad, B. L. V., ?Vice to virtue: intracellular biogenic nanoparticles for the generation of carbon supported catalysts?, Journal of Nanoscience and Nanotechnology, vol. 10, no. 2, pp. 905-911, 2010.\par \par }