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\bibitem{Colomer_etal1998} {\textquotedblleft}\textit{Purification of catalytically produced multi-wall nanotubes}{\textquotedblright}. Colomer J-F, Piedigrosso P, Willems I, Journet C, Bernier P, Van Tendeloo G, Fonseca A, Nagy JB, Journal of the Chemical Society : Faraday transactions: physical chemistry and chemical physics \textbf{94}, 3753 (1998).   http://doi.org/10.1039/a806804f

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