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\bibitem{Peeters_etal1992} {\textquotedblleft}\textit{Carrier-concentration-dependent polaron cyclotron resonance in GaAs-heterostructures}{\textquotedblright}. Peeters FM, Wu X, Devreese JT, Langerak CJGM, Singleton J, Barnes DJ, Nicholas RJ, Physical review: B \textbf{45}, 4296 (1992).   http://doi.org/10.1103/PhysRevB.45.4296

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