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\bibitem{Peeters_etal1991} {\textquotedblleft}\textit{Magneto-phonon resonances in the resistance and the optical absorption spectrum of heterostructures}{\textquotedblright}. Peeters FM, Wu XG, Devreese JT, Physica scripta \textbf{T39}, 302 (1991).   http://doi.org/10.1088/0031-8949/1991/T39/046

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