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\bibitem{Ferreira_etal2006} {\textquotedblleft}\textit{Melting of a two-dimensional binary cluster of charged particles confined in a parabolic trap}{\textquotedblright}.  Ferreira WP, Munarin FF, Farias GA, Peeters FM;, Journal of physics : condensed matter \textbf{18}, 9385 (2006).   http://doi.org/10.1088/0953-8984/18/41/006

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