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\bibitem{Lebedev_etal2004} {\textquotedblleft}\textit{Structure and microstructure of nanoscale mesoporous silica spheres}{\textquotedblright}. Lebedev OI, Van Tendeloo G, Collart O, Cool P, Vansant EF, Solid state sciences \textbf{6}, 489 (2004).   http://doi.org/10.1016/j.solidstatesciences.2004.01.013

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