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\bibitem{Kroug_etal1997} Kroug M, Yagoubov P, Gol{\textquoteright}tsman G, Kollberg E. NbN quasioptical phonon cooled hot electron bolometric mixers at THz frequencies. In: Inst. Phys. Conf. Ser. Vol 1. Bristol; 1997. p. 405--8.

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