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\bibitem{deWitte_etal2007} {\textquotedblleft}\textit{Multistep loading of titania nanoparticles in the mesopores of SBA-15 for enhanced photocatalytic activity}{\textquotedblright}. de Witte K, Cool P, de Witte I, Ruys L, Rao J, Van Tendeloo G, Vansant EF, Journal of nanoscience and nanotechnology \textbf{7}, 2511 (2007).   http://doi.org/10.1166/jnn.2007.445

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