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\bibitem{Rasulova_etal2011} Rasulova, G. K., Brunkov, P. N., Pentin, I. V., Kovalyuk, V. V., Gorshkov, K. N., Kazakov, A. Y., et al. (2011). Mutual synchronization of two coupled self-oscillators based on GaAs/AlGaAs superlattices. \textit{Tech. Phys.}, \textit{56}(6), 826--830.

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