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\bibitem{Semenov_etal2007} Semenov, A. D., Richter, H., Hubers, H. - W., Gunther, B., Smirnov, A., Il{\textquoteright}in, K. S., et al. (2007). Terahertz performance of integrated lens antennas with a hot-electron bolometer. \textit{IEEE Trans. Microw. Theory Techn.}, \textit{55}(2), 239--247.

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