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\bibitem{Munarin_etal2008} {\textquotedblleft}\textit{Ground state and normal-mode spectra of a two-dimensional system of dipole particles confined in a parabolic trap}{\textquotedblright}. Munarin FF, Ferreira WP, Farias GA, Peeters FM, Physical review : E : statistical, nonlinear, and soft matter physics \textbf{78}, 031405 (2008).   http://doi.org/10.1103/PhysRevE.78.031405

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