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\bibitem{Leadley_etal1994} {\textquotedblleft}\textit{Disappearance of magnetophonon resonance at high magnetic fields in GaAs-GaAlAs heterojunctions}{\textquotedblright}. Leadley DR, Nicholas RJ, Singleton J, Xu W, Peeters FM, Devreese JT, van Bockstal L, Herlach F, Perenboom JAAJ, Harris JJ, Foxon CT, Surface science : a journal devoted to the physics and chemistry of interfaces \textbf{305}, 327 (1994).   http://doi.org/10.1016/0039-6028(94)90910-5

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