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\bibitem{Cheng_etal2006} {\textquotedblleft}\textit{Natural mineral-marine manganese nodule as a novel catalyst for the synthesis of carbon nanotubes}{\textquotedblright}. Cheng JP, Zhang XB, Ye Y, Tao XY, Liu F, Li Y, Van Tendeloo G, Journal of Wuhan University of Technology: materials science edition \textbf{21}, 29 (2006)

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