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\bibitem{Stevens_etal2006} {\textquotedblleft}\textit{Formation mechanism of SBA-16 spheres and control of their dimensions}{\textquotedblright}. Stevens WJJ, Mertens M, Mullens S, Thijs I, Van Tendeloo G, Cool P, Vansant EF, Microporous and mesoporous materials \textbf{93}, 119 (2006).   http://doi.org/10.1016/j.micromeso.2006.02.015

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