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\bibitem{Aguilera-Verdugo_etal2020} Aguilera-Verdugo, J. J., Driencourt-Mangin, F., Hernandez-Pinto, R. J., Plenter, J., Ramirez-Uribe, S., Renteria-Olivo, A. E., et al. (2020). Open Loop Amplitudes and Causality to All Orders and Powers from the Loop-Tree Duality. \textit{Phys. Rev. Lett.}, \textit{124}(21), 211602--6pp.

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