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\bibitem{Verbruggen_etal2011} {\textquotedblleft}\textit{The benefit of glass bead supports for efficient gas phase photocatalysis : case study of a commercial and a synthesised photocatalyst}{\textquotedblright}. Verbruggen SW, Ribbens S, Tytgat T, Hauchecorne B, Smits M, Meynen V, Cool P, Martens JA, Lenaerts S, Chemical engineering journal \textbf{174}, 318 (2011).   http://doi.org/10.1016/J.CEJ.2011.09.038

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