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\bibitem{Kong_etal2004} {\textquotedblleft}\textit{Nonlinear screening in large two-dimensional Coulomb clusters}{\textquotedblright}. Kong M, Vagov A, Partoens B, Peeters FM, Ferreira WP, Farias GA, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{70}, 051807 (2004).   http://doi.org/10.1103/PhysRevE.70.051807

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