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\bibitem{Riva_etal2001} {\textquotedblleft}\textit{Magnetic field dependence of the energy of negatively charged excitons in semiconductor quantum wells}{\textquotedblright}. Riva C, Peeters FM, Varga K, Physical review : B : condensed matter and materials physics \textbf{63}, 115302 (2001).   http://doi.org/10.1103/PhysRevB.63.115302

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