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\bibitem{Baselmans_etal2003} Baselmans, J. J. A., Hajenius, M., Gao, J. R., Klapwijk, T. M., de Korte, P. A. J., Voronov, B., et al. (2003). Noise performance of NbN hot electron bolometer mixers at 2.5 THz and its dependence on the contact resistance. In \textit{Proc. 14$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 11--19).

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