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\bibitem{Yagoubov_etal1999} Yagoubov, P., Kroug, M., Merkel, H., Kollberg, E., Schubert, J., Hubers, H. W., et al. (1999). Hot electron bolometric mixers based on NbN films deposited on MgO substrates. In \textit{Inst. Phys. Conf. Ser.} (Vol. 167, pp. 687--690). Barcelona, Spain.

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