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\bibitem{Finkel_etal2016} Finkel, M., Thierschmann, H. R., Galatro, L., Katan, A. J., Thoen, D. J., de Visser, P. J., et al. (2016). Branchline and directional THz coupler based on PECVD SiNx-technology. In \textit{41st IRMMW-THz}.

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