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\bibitem{Brown_etal2006} Brown, E. R., Lee, A. W. M., Navi, B. S., \& Bjarnason, J. E. (2006). Characterization of a planar self-complementary square-spiral antenna in the THz region. \textit{Microwave Opt Technol Lett}, \textit{48}(3), 524--529.

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