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\bibitem{Sych_etal2018} Sych, D., Shcherbatenko, M., Elezov, M., \& Goltsman, G. N. (2018). Towards the improvement of the heterodyne receiver sensitivity beyond the quantum noise limit. In \textit{Proc. 29$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 245--247).

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