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\bibitem{Ferreira_etal2003} {\textquotedblleft}\textit{Normal mode spectra of two-dimensional classical atoms confined by a Coulomb potential}{\textquotedblright}. Ferreira WP, Peeters FM, Farias GA, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{68}, 066405 (2003).   http://doi.org/10.1103/PhysRevE.68.066405

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