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\bibitem{Ruelle_etal2008} {\textquotedblleft}\textit{Functionalization of MWCNTs with atomic nitrogen : electronic structure}{\textquotedblright}.  Ruelle B, Felten A, Ghijsen J, Drube W, Johnson RL, Liang D, Erni R, Van Tendeloo G, Dubois P, Hecq M, Bittencourt C;, Journal of physics: D: applied physics \textbf{41}, 045202 (2008).   http://doi.org/10.1088/0022-3727/41/4/045202

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