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\bibitem{Bohr_etal1992} {\textquotedblleft}\textit{Order, disorder and structure of crystals C$_{60}$/C$_{70}$}{\textquotedblright}. Bohr J, Gibbs D, Sinha SK, Kr{\"a}tschmer W, Van Tendeloo G, Larsen E, Egsgaard H, Berman LE, Europhysics letters \textbf{17}, 327 (1992).   http://doi.org/10.1209/0295-5075/17/4/008

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