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\bibitem{Szafran+Peeters2004} {\textquotedblleft}\textit{Re-entrant pinning of Wigner molecules in a magnetic field due to a Coulomb impurity}{\textquotedblright}. Szafran B, Peeters FM, Europhysics letters \textbf{66}, 701 (2004).   http://doi.org/10.1209/epl/i2003-10250-8

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