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\bibitem{Nagatsuma_etal2005} Nagatsuma, T., Hirata, A., Sato, Y., Yamaguchi, R., Takahashi, H., Kosugi, T., et al. (2005). Sub-Terahertz Wireless Communications Technologies. In \textit{Proc. 18th International Conference on Applied Electromagnetics and Communications (ICECom 2005)} (pp. 1--4).

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