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A. B.  Patil, Patil, K. R., and Pardeshi, S. K., ?Ecofriendly synthesis and solar photocatalytic activity of S-doped ZnO?, Journal of Hazardous Materials, vol. 183, no. 1-3, pp. 315-323, 2010.\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 V. V.  Balasubramanian, Devassay, B. M., Halligudi, S. B., Deepika, R., Umbarakar, S. B., and Vinu, A., ?Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts?, Journal of Nanoscience and Nanotechnology, vol. 18, no. 4, pp. 2986-2992, 2018.\par \par K.  Mulani, Patil, V., Chavan, N., and Donde, K., ?Adsorptive removal of chromium(VI) using spherical resorcinol-formaldehyde beads prepared by inverse suspension polymerization?,  Journal of Polymer Research, vol. 26, no. 2, p. 41, 2019.\par \par }