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\bibitem{Kong_etal2003} {\textquotedblleft}\textit{Topological defects and nonhomogeneous melting of large two-dimensional Coulomb clusters}{\textquotedblright}. Kong M, Partoens B, Peeters FM, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{67}, 021608 (2003).   http://doi.org/10.1103/PhysRevE.67.021608

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