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\bibitem{Baselmans_etal2004} Baselmans, J. J. A., Hajenius, M., Gao, J. R., Klapwijk, T. M., de Korte, P. A. J., Voronov, B., et al. (2004). Doubling of sensitivity and bandwidth in phonon cooled hot electron bolometer mixers. \textit{Appl. Phys. Lett.}, \textit{84}(11), 1958--1960.

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