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\bibitem{Cherednichenko_etal2000} Cherednichenko S, Kroug M, Yagoubov P, Merkel H, Kollberg E, Yngvesson KS, et al. IF bandwidth of phonon cooled HEB mixers made from NbN films on MgO substrates. In: Proc. 11$^{th}$ Int. Symp. Space Terahertz Technol.; 2000. p. 219--27.

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