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\bibitem{Ahonen_etal1999} {\textquotedblleft}\textit{Preparation of nanocrystalline titania powder via aerosol pyrolysis of titanium tetrabutoxide}{\textquotedblright}. Ahonen PP, Kauppinen EI, Joubert JC, Deschanvres JL, Van Tendeloo G, Journal of materials research \textbf{14}, 3938 (1999).   http://doi.org/10.1557/JMR.1999.0533

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