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\bibitem{Liu_etal2009} {\textquotedblleft}\textit{A scanning electron microscopy study on hollow silica microspheres: defects and influences of the synthesis composition}{\textquotedblright}. Liu S, Wei M, Sui X, Cheng X, Cool P, Van Tendeloo G, Journal of sol-gel science and technology \textbf{49}, 373 (2009).   http://doi.org/10.1007/s10971-008-1875-0

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