P. Pongjirawat, S. Kaenthong, and T. Mongkhonsi, “Effects of HCl and HNO3 on the oxidation of toluene to benzaldehyde by H2O2 over TS-1 modified with Al in aqueous phase”, Eng Appl Sci Res, vol. 41, no. 3, pp. 415–420, Oct. 2014.