Ediati, R., M. Ulfa, H. Fansuri, Z. Ramli, H. Nur, and D. Prasetyoko. “Influence of TiO2/TS-1 Calcination on Hydroxylation of Phenol”. Journal of Mathematical and Fundamental Sciences, vol. 46, no. 1, Apr. 2014, pp. 76-90, doi:10.5614/j.math.fund.sci.2014.46.1.7.