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\bibitem{Chang+Peeters2001} {\textquotedblleft}\textit{Bright to dark exciton transition in symmetric coupled quantum wells}{\textquotedblright}. Chang K, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{63} (2001).   http://doi.org/10.1103/PhysRevB.63.153307

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