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\bibitem{Biro_etal2002} {\textquotedblleft}\textit{Catalyst traces and other impurities in chemically purified carbon nanotubes grown by CVD}{\textquotedblright}.  Bir{\'o} LP, Khanh NQ, V{\'e}rtesy Z, Horv{\'a}th ZE, Osv{\'a}th Z, Ko{\'o}s A, Gyulai J, Kocsonya A, K{\'o}nya Z, Zhang XB, Van Tendeloo G, Fonseca A, Nagy JB;, Materials science and engineering: part C: biomimetic materials
T2 -- EMRS Spring Meeting, JUN 05-08, 2001, STRASBOURG, FRANCE \textbf{19}, 9 (2002).   http://doi.org/10.1016/S0928-4931(01)00407-6

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