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\bibitem{Huebers_etal2001} H{\"u}bers, H. - W., Semenov, A. D., Richter, H., Schubert, J., Hadjiloucas, S., Bowen, J. W., et al. (2001). Antenna pattern of the quasi-optical hot-electron bolometric mixer at terahertz frequencies. In \textit{Proc. 12$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 286--296). San Diego, CA, USA.

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