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\bibitem{Loudkov_etal2002} Loudkov, D., Khosropanah, P., Cherednichenko, S., Adam, A., MerkeI, H., Kollberg, E., et al. (2002). Broadband fourier transform spectrometer (FTS) measurements of spiral and double-slot planar antennas at THz frequencies. In \textit{Proc. 13$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 373--369).

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