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\bibitem{Gao_etal2004} Gao, J. R., Hajenius, M., Baselmans, J. J. A., Klapwijk, T. M., de Korte, P. A. J., Voronov, B., et al. (2004). NbN hot electron bolometer mixers with superior performance for space applications. In E. Armandillo, \& B. Leone (Eds.), \textit{Proc. Int. workshop on low temp. electronics} (pp. 11--17). Noordwijk.

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