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\bibitem{Munarin_etal2007} {\textquotedblleft}\textit{Molecular states of two vertically coupled systems of classical charged particles confined by a Coulomb potential}{\textquotedblright}. Munarin FF, Ferreira WP, Farias GA, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{76}, 035336 (2007).   http://doi.org/10.1103/PhysRevB.76.035336

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