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\bibitem{Ren_etal2019} Ren, Y., Zhang, D. X., Zhou, K. M., Miao, W., Zhang, W., Shi, S. C., et al. (2019). 10.6 μm heterodyne receiver based on a superconducting hot-electron bolometer mixer and a quantum cascade laser. \textit{AIP Advances}, \textit{9}(7), 075307.

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