R. K. Seenivasan, D. Ragavan, A. Girija, and R. Muthuramalingam, “SYNTHESIS, CHARACTERISATION AND APPLICATION OF PHENOL-FORMALDEHYDE RESIN BLENDED WITH SULPHONATED PHYLLANTHUS EMBLICA, LINN., CARBON”, JAC, vol. 9, no. 2, pp. 1921–1932, Apr. 2013.