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\bibitem{Luyten_etal1993} {\textquotedblleft}\textit{Electron diffraction effects of conical, helically wound, graphite whiskers}{\textquotedblright}. Luyten W, Krekels T, Amelinckx S, Van Tendeloo G, van Dyck D, van Landuyt J, Ultramicroscopy \textbf{49}, 123 (1993).   http://doi.org/10.1016/0304-3991(93)90219-N

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