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\bibitem{Smirnov_etal2019} Smirnov, A., Golubev, E., Arkhipov, M., Filina, E., Pyshnov, V., Myshonkova, N., et al. (2019). Millimetron Space Observatory: progress in the development of payload module. In \textit{Proc. 30$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 180--181).

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