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\bibitem{Beyers_etal2009} {\textquotedblleft}\textit{Combined TiO$_{2}$/SiO$_{2}$ mesoporous photocatalysts with location and phase controllable TiO$_{2}$ nanoparticles}{\textquotedblright}. Beyers E, Biermans E, Ribbens S, de Witte K, Mertens M, Meynen V, Bals S, Van Tendeloo G, Vansant EF, Cool P, Applied catalysis : B : environmental \textbf{88}, 515 (2009).   http://doi.org/10.1016/j.apcatb.2008.10.009

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