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\bibitem{Koshelets_etal2005} Koshelets, V. P., Dmitriev, P. N., Ermakov, A. B., Sobolev, A. S., Torgashin, M. Y., Kurin, V. V., et al. (2005). Optimization of the phase-locked flux-flow oscillator for the submm integrated receiver. \textit{IEEE Trans. Appl. Supercond.}, \textit{15}(2), 964--967.

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