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\bibitem{Baselmans_etal2005} Baselmans, J., Kooi, J., Baryshev, A., Yang, Z. Q., Hajenius, M., Gao, J. R., et al. (2005). Full characterization of small volume NbN HEB mixers for space applications. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 457--462). G{\"o}teborg, Sweden.

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