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\bibitem{Fernandez-Martinez_etal2023} Fernandez-Martinez, E., Gonzalez-Lopez, M., Hernandez-Garcia, J., Hostert, M., \& Lopez-Pavon, J. (2023). Effective portals to heavy neutral leptons. \textit{J. High Energy Phys.}, \textit{09}(9), 001--45pp.

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