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\bibitem{Xiao_etal2018} {\textquotedblleft}\textit{Hierarchically dual-mesoporous TiO$_{2}$ microspheres for enhanced photocatalytic properties and lithium storage}{\textquotedblright}. Xiao S, Lu Y, Xiao B-Y, Wu L, Song J-P, Xiao Y-X, Wu S-M, Hu J, Wang Y, Chang G-G, Tian G, Lenaerts S, Janiak C, Yang X-Y, Su B-L, Chemistry: a European journal \textbf{24}, 13246 (2018).   http://doi.org/10.1002/CHEM.201801933

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