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\bibitem{Neyts2015} {\textquotedblleft}\textit{The role of ions in plasma catalytic carbon nanotube growth : a review}{\textquotedblright}. Neyts EC, Frontiers of Chemical Science and Engineering \textbf{9}, 154 (2015).   http://doi.org/10.1007/s11705-015-1515-5

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