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\bibitem{Cherednichenko_etal2001} Cherednichenko, S., Kroug, M., Merkel, H., Kollberg, E., Loudkov, D., Smirnov, K., et al. (2001). Local oscillator power requirement and saturation effects in NbN HEB mixers. In C. Iit.u.t.e of T. Jet Propulsion Laboratory (Ed.), \textit{Proc. 12$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 273--285). San Diego, CA, USA.

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