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\bibitem{Freire_etal2002} {\textquotedblleft}\textit{Exciton trapping in a periodically modulated magnetic field}{\textquotedblright}. Freire JAK, Freire VN, Farias GA, Peeters FM, Brazilian journal of physics \textbf{32}, 310 (2002).   http://doi.org/10.1590/S0103-97332002000200016

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