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\bibitem{Tomecka_etal2009} {\textquotedblleft}\textit{Ground state configurations and melting of two-dimensional non-uniformly charged classical clusters}{\textquotedblright}. Tomecka DM, Kamieniarz G, Partoens B, Peeters FM, Journal of physics : condensed matter \textbf{21}, 155301 (2009).   http://doi.org/10.1088/0953-8984/21/15/155301

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