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\bibitem{VanTendeloo_etal2003} {\textquotedblleft}\textit{Structure of nanoscale mesoporous silica spheres?}{\textquotedblright}.Van Tendeloo G, Lebedev OI, Collart O, Cool P, Vansant EF, Journal of physics : condensed matter \textbf{15}, S3037 (2003)

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