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\bibitem{Bittencourt_etal2012} {\textquotedblleft}\textit{Study of the interaction between copper and carbon nanotubes}{\textquotedblright}. Bittencourt C, Ke X, Van Tendeloo G, Thiess S, Drube W, Ghijsen J, Ewels CP, Chemical physics letters \textbf{535}, 80 (2012).   http://doi.org/10.1016/j.cplett.2012.03.045

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