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\bibitem{Baryshev_etal2005} Baryshev, A., Baselmans, J. J. A., Reker, S. F., Hajenius, M., Gao, J. R., Klapwijk, T. M., et al. (2005). Direct detection effect in hot electron bolometer mixers. In \textit{Proc. 16$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 463--464).

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