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\bibitem{Ferreira_etal2002} {\textquotedblleft}\textit{Structural transitions in a classical two-dimensional molecule system}{\textquotedblright}. Ferreira WP, Farias GA, Carmona HA, Peeters FM, Solid state communications \textbf{122}, 665 (2002).   http://doi.org/10.1016/S0038-1098(02)00157-6

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