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\bibitem{Hajenius_etal2007} Hajenius, M., Yang, Z. Q., Gao, J. R., Baselmans, J. J. A., Klapwijk, T. M., Voronov, B., et al. (2007). Optimized sensitivity of NbN hot electron bolometer mixers by annealing. \textit{IEEE Trans. Appl. Supercond.}, \textit{17}(2), 399--402.

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