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\bibitem{Riva_etal2000} {\textquotedblleft}\textit{Ground state of excitons and charged excitons in a quantum well}{\textquotedblright}. Riva C, Peeters FM, Varga K, Physica status solidi: A: applied research
T2 -- 6th International Conference on Optics of Excitons in Confined Systems, (OECS-6), AUG 30-SEP 02, 1999, ASCONA, SWITZERLAND \textbf{178}, 513 (2000).   http://doi.org/10.1002/1521-396X(200003)178:1<513::AID-PSSA513>3.0.CO;2-1

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