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\bibitem{Xu_etal1993} {\textquotedblleft}\textit{Normal and hot electro-phonon resonance effect in a quasi-two-dimensional semiconductor system}{\textquotedblright}. Xu W, Peeters FM, Devreese JT, Journal of physics : condensed matter \textbf{5}, 2307 (1993).   http://doi.org/10.1088/0953-8984/5/15/004

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