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\bibitem{FloetD.W._etal2000} Floet D. W., Gao J. R., Klapwijk T. M., \& de Korte P. A. J. (2000). Bias Dependence of the Thermal Time Constant in Nb Superconducting Diffusion-Cooled HEB Mixers. \textit{Appl. Phys. Lett.}, \textit{77}, 1719.

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