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\bibitem{Nikolaev+Michel2001} {\textquotedblleft}\textit{Electronic structure and electric quadrupoles of a polymerized chain in solid AC$_{60}$}{\textquotedblright}. Nikolaev AV, Michel KH, Solid state communications \textbf{117}, 739 (2001).   http://doi.org/10.1016/S0038-1098(01)00017-5

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