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\bibitem{Verbruggen_etal2014} {\textquotedblleft}\textit{Cost-effectiveness analysis to assess commercial TiO$_{2}$ photocatalysts for acetaldehyde degradation in air}{\textquotedblright}. Verbruggen SW, Tytgat T, Van Passel S, Martens JA, Lenaerts S, Chemicke zvesti \textbf{68}, 1273 (2014).   http://doi.org/10.2478/S11696-014-0557-3

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