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\bibitem{Gao_etal2005} Gao, J. R., Hajenius, M., Baselmans, J. J. A., Yang, Z. Q., Baryshev, A. M., Barends, R., et al. (2005). Twin-slot antenna coupled NbN hot electron bolometer mixers for space applications. In \textit{Proc. 9-th WMSCI} (Vol. 9, pp. 148--153). International Institute of Informatics and Systemics.

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