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\bibitem{Castelano_etal2007} {\textquotedblleft}\textit{Ground state configurations of vertically coupled quantum rings}{\textquotedblright}. Castelano LK, Hai G-Q, Partoens B, Peeters FM, Physica status solidi: C: conferences and critical reviews \textbf{4}, 560 (2007).   http://doi.org/10.1002/pssc.200673275

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