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\bibitem{Shangina_etal2011} Shangina, E. L., Smirnov, K. V., Morozov, D. V., Kovalyuk, V. V., Goltsman, G. N., Verevkin, A. A., et al. (2011). Concentration dependence of energy relaxation time in AlGaAs/GaAs heterojunctions: direct measurements. \textit{Semicond. Sci. Technol.}, \textit{26}(2), 025013.

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