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\bibitem{Peeters_etal1997} {\textquotedblleft}\textit{Classical molecules in two dimensions}{\textquotedblright}. Peeters FM, Partoens B, Schweigert VA, Goldoni G, Physica: E \textbf{1}, 219 (1997).   http://doi.org/10.1016/S1386-9477(97)00069-6

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