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\bibitem{Pauwels_etal2001} {\textquotedblleft}\textit{Structure determination of spherical MCM-41 particles}{\textquotedblright}. Pauwels B, Van Tendeloo G, Thoelen C, van Rhijn W, Jacobs PA, Advanced materials \textbf{13}, 1317 (2001).   http://doi.org/10.1002/1521-4095(200109)13:17<1317::AID-ADMA1317>3.0.CO;2-5

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