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\bibitem{Verberck+Michel2007} {\textquotedblleft}\textit{Nanotube field of C$_{60}$ and C$_{70}$ molecules in carbon nanotubes}{\textquotedblright}. Verberck B, Michel KH, International journal of quantum chemistry \textbf{107}, 2294 (2007).   http://doi.org/10.1002/qua.21309

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