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\bibitem{Verberck2011} {\textquotedblleft}\textit{Orientational properties of C$_{70}$ and C$_{80}$ fullerenes in carbon nanotubes}{\textquotedblright}. Verberck B, Physical review : B : condensed matter and materials physics \textbf{83}, 045405 (2011).   http://doi.org/10.1103/PhysRevB.83.045405

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