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\bibitem{Felten_etal2008} {\textquotedblleft}\textit{Photoemission study of CF$_{4}$ rf-plasma treated multi-wall carbon nanotubes}{\textquotedblright}. Felten A, Ghijsen J, Pireaux J-J, Whelan CM, Liang D, Van Tendeloo G, Bittencourt C, Carbon \textbf{46}, 1271 (2008).   http://doi.org/10.1016/j.carbon.2008.04.027

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