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\bibitem{Freire_etal2000} {\textquotedblleft}\textit{Fine structure of excitons in a quantum well in the presence of a non-homogeneous magnetic field}{\textquotedblright}. Freire JAK, Matulis A, Peeters FM, Freire VN, Farias GA, Physical review : B : condensed matter and materials physics \textbf{62}, 7316 (2000).   http://doi.org/10.1103/PhysRevB.62.7316

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