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\bibitem{Riva_etal2002} {\textquotedblleft}\textit{Correlation energy and configuration of biexcitons in quantum wells}{\textquotedblright}. Riva C, Peeters FM, Varga K, Schweigert VA, Physica status solidi: B: basic research \textbf{234}, 50 (2002).   http://doi.org/10.1002/1521-3951(200211)234:1<50::AID-PSSB50>3.0.CO;2-R

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