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\bibitem{Zhang_etal1994} {\textquotedblleft}\textit{{\textquotedblleft}Harmless{\textquotedblright} carbon tubes around {\textquotedblleft}dangerous{\textquotedblright} asbestos fibres}{\textquotedblright}. Zhang XF, Zhang XB, Van Tendeloo G, Meijer G, Carbon \textbf{32}, 363 (1994).   http://doi.org/10.1016/0008-6223(94)90206-2

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