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\bibitem{Baselmans_etal2005} Baselmans J, Kooi J, Baryshev A, Yang ZQ, Hajenius M, Gao JR, et al. Full characterization of small volume NbN HEB mixers for space applications. In: Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol. G{\"o}teborg, Sweden; 2005. p. 457--62.

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