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\bibitem{Verberck+Michel2006} {\textquotedblleft}\textit{Nanotube field of C$_{60}$ molecules in carbon nanotubes: atomistic versus continuous approach}{\textquotedblright}. Verberck B, Michel KH, Physical review : B : condensed matter and materials physics \textbf{74}, 045421 (2006).   http://doi.org/10.1103/PhysRevB.74.045421

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