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\bibitem{Lebedev_etal2012} {\textquotedblleft}\textit{New nano-architectures of mesoporous silica spheres analyzed by advanced electron microscopy}{\textquotedblright}. Lebedev OI, Turner S, Liu S, Cool P, Van Tendeloo G, Nanoscale \textbf{4}, 1722 (2012).   http://doi.org/10.1039/c2nr11715k

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