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\bibitem{Xu_etal1993} {\textquotedblleft}\textit{Electrophonon resonances in a quasi-two-dimensional electron system}{\textquotedblright}. Xu W, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics \textbf{48}, 1562 (1993).   http://doi.org/10.1103/PhysRevB.48.1562

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