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\bibitem{Corthals_etal2012} {\textquotedblleft}\textit{The beneficial effect of CO$_{2}$ in the low temperature synthesis of high quality carbon nanofibers and thin multiwalled carbon nanotubes from CH$_{_\{4}$\} over Ni catalysts}{\textquotedblright}. Corthals S, van Noyen J, Geboers J, Vosch T, Liang D, Ke X, Hofkens J, Van Tendeloo G, Jacobs P, Sels B, Carbon \textbf{50}, 372 (2012).   http://doi.org/10.1016/j.carbon.2011.08.047

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