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\bibitem{Michel_etal1992} {\textquotedblleft}\textit{Microscopic theory of orientational disorder and the orientational phase transition in solid C$_{60}$}{\textquotedblright}. Michel KH, Copley JRD, Neumann DA, Physical review letters \textbf{68}, 2929 (1992).   http://doi.org/10.1103/PhysRevLett.68.2929

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