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\bibitem{Krugel_etal2006} {\textquotedblleft}\textit{Coherent nonlinear optical response of excitons and biexcitons in quantum dots coupled to phonons}{\textquotedblright}. Krugel A, Axt VM, Kuhn T, Vagov A, Peeters FM, Physica status solidi B -- basic solid state physics \textbf{243}, 2241 (2006).   http://doi.org/10.1002/pssb.200668034

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