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\bibitem{Ruelle_etal2009} {\textquotedblleft}\textit{Functionalization of MWCNTs with atomic nitrogen}{\textquotedblright}.  Ruelle B, Felten A, Ghijsen J, Drube W, Johnson RL, Liang D, Erni R, Van Tendeloo G, Sophie P, Dubois P, Godfroid T, Hecq M, Bittencourt C;, Micron \textbf{40}, 85 (2009).   http://doi.org/10.1016/j.micron.2008.01.003

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