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\bibitem{Chen_etal2003} {\textquotedblleft}\textit{Ground state configurations of two-dimensional plasma crystals under long-range attractive particle interaction force}{\textquotedblright}. Chen Z, Kong M, Milo{\v s}evi{\'c} MV, Wu Y, Physica scripta \textbf{67}, 439 (2003).   http://doi.org/10.1238/Physica.Regular.067a00439

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