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\bibitem{Partoens+Deo2004} {\textquotedblleft}\textit{Structure and spectrum of classical two-dimensional clusters with a logarithmic interaction potential}{\textquotedblright}. Partoens B, Deo PS, Physical review : B : condensed matter and materials physics \textbf{69}, 245415 (2004).   http://doi.org/10.1103/PhysRevB.69.245415

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