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\bibitem{Yang_etal2005} Yang, Z. Q., Hajenius, M., Baselmans, J. J. A., Gao, J. R., Klapwijk, T. M., Voronov, B., et al. (2005). Improved sensitivity of NbN hot electron bolometer mixers by vacuum baking. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 222--225).

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