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\bibitem{Verberck_etal2004} {\textquotedblleft}\textit{Valence electronic charge density of distorted C60-monomers in polymerized KC60 and RbC60}{\textquotedblright}. Verberck B, Popov VN, Nikolaev AV, Lamoen D, The journal of chemical physics \textbf{121}, 321 (2004).   http://doi.org/10.1063/1.1755676

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