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\bibitem{Castelano_etal2006} {\textquotedblleft}\textit{Two vertically coupled quantum rings with tunneling}{\textquotedblright}. Castelano LK, Hai GQ, Partoens B, Peeters FM, Brazilian journal of physics \textbf{36}, 936 (2006).   http://doi.org/10.1590/S0103-97332006000600037

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