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\bibitem{Castelano_etal2006} {\textquotedblleft}\textit{Artificial molecular quantum rings: spin density functional theory calculations}{\textquotedblright}. Castelano LK, Hai G-Q, Partoens B, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{74}, 045313 (2006).   http://doi.org/10.1103/PhysRevB.74.045313

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