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\bibitem{Cherednichenko_etal2000} Cherednichenko, S., Kroug, M., Yagoubov, P., Merkel, H., Kollberg, E., Yngvesson, K. S., et al. (2000). IF bandwidth of phonon cooled HEB mixers made from NbN films on MgO substrates. In \textit{Proc. 11$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 219--227).

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