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

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