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\bibitem{Cherednichenko_etal2002} Cherednichenko, S., Kroug, M., Khosropanah, P., Adam, A., Merkel, H., Kolberg, E., et al. (2002). A broadband terahertz heterodyne receiver with an NbN HEB mixer. In Harward University (Ed.), \textit{Proc. 13$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 85--95). Cambridge, MA, USA.

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