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\bibitem{Bittencourt_etal2011} {\textquotedblleft}\textit{Atomic oxygen functionalization of vertically aligned carbon nanotubes}{\textquotedblright}. Bittencourt C, Navio C, Nicolay A, Ruelle B, Godfroid T, Snyders R, Colomer J-F, Lagos MJ, Ke X, Van Tendeloo G, Suarez-Martinez I, Ewels CP, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{115}, 20412 (2011).   http://doi.org/10.1021/jp2057699

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