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\bibitem{Corthals_etal2011} {\textquotedblleft}\textit{A cyclic catalyst pretreatment in CO$_{2}$ for high yield production of Carbon nanofibers with narrow diameter distribution}{\textquotedblright}. Corthals S, van Noyen J, Liang D, Ke X, Van Tendeloo G, Jacobs P, Sels B, Catalysis letters \textbf{141}, 1621 (2011).   http://doi.org/10.1007/s10562-011-0690-3

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