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\bibitem{Schweigert_etal1996} {\textquotedblleft}\textit{Properties of two-dimensional Coulomb clusters confined in a ring}{\textquotedblright}. Schweigert IV, Schweigert VA, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{54}, 10827 (1996).   http://doi.org/10.1103/PhysRevB.54.10827

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