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

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