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\bibitem{Du_etal2006} {\textquotedblleft}\textit{Flowerlike ZnO nanocones and nanowires: preparation, structure, and luminescence}{\textquotedblright}. Du GH, Xu F, Yuan ZY, Van Tendeloo G, Applied physics letters \textbf{88}, 243101 (2006).   http://doi.org/10.1063/1.2211007

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