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\bibitem{Ferreira_etal2003} {\textquotedblleft}\textit{Structure and correlations in two-dimensional classical artificial atoms confined by a Coulomb potential}{\textquotedblright}. Ferreira WP, Matulis A, Farias GA, Peeters FM, Physical review : E : statistical, nonlinear, and soft matter physics \textbf{67}, 046601 (2003).   http://doi.org/10.1103/PhysRevE.67.046601

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