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\bibitem{Ekstoerm_etal1997} Ekst{\"o}rm H, Kollberg E, Yagoubov P, Gol{\textquoteright}tsman G, Gershenzon E, Yngvesson S. Gain and noise bandwidth of NbN hot-electron bolometric mixers. Appl Phys Lett. 1997;70(24):3296--8.

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