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\bibitem{Piedigrosso_etal2000} {\textquotedblleft}\textit{Production of differently shaped multi-wall carbon nanotubes using various cobalt supported catalysts}{\textquotedblright}. Piedigrosso P, Konya Z, Colomer J-F, Fonseca A, Van Tendeloo G, Nagy JB, Physical chemistry, chemical physics \textbf{2}, 163 (2000).   http://doi.org/10.1039/a905622j

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