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\bibitem{Coves_etal2022} Coves, A., Maestre, H., Archiles, R., Andres, M. V., \& Gimeno, B. (2022). Surface-Impedance Formulation for Hollow-Core Waveguides Based on Subwavelength Gratings. \textit{IEEE Access}, \textit{10}, 18843--18854.

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