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\bibitem{Baselmans_etal2005} Baselmans, J. J. A., Hajenius, M., Gao, J. R., Baryshev, A., Kooi, J., Klapwijk, T. M., et al. (2005). NbN hot electron bolometer mixers: sensitivity, LO power, direct detection and stability. \textit{IEEE Trans. Appl. Supercond.}, \textit{15}(2), 484--489.

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