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\bibitem{vanWalsem_etal2016} {\textquotedblleft}\textit{CFD investigation of a multi-tube photocatalytic reactor in non-steady-state conditions}{\textquotedblright}. van Walsem J, Verbruggen SW, Modde B, Lenaerts S, Denys S, Chemical engineering journal \textbf{304}, 808 (2016).   http://doi.org/10.1016/J.CEJ.2016.07.028

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