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\bibitem{Nikolaev+Michel2005} {\textquotedblleft}\textit{Superexchange and electron correlations in alkali fullerides AC$_{60}$, A=K, Rb, Cs}{\textquotedblright}. Nikolaev AV, Michel KH, The journal of chemical physics \textbf{122}, 064310 (2005).   http://doi.org/10.1063/1.1844491

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