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\bibitem{Kooi_etal2007} Kooi, J. W., Baselmans, J. J. A., Hajenius, M., Gao, J. R., Klapwijk, T. M., Dieleman, P., et al. (2007). IF impedance and mixer gain of NbN hot electron bolometers. \textit{J. Appl. Phys.}, \textit{101}(4), 044511.

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