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\bibitem{Aguilera-Verdugo_etal2021} Aguilera-Verdugo, J. J., Hernandez-Pinto, R. J., Rodrigo, G., Sborlini, G. F. R., \& Torres Bobadilla, W. J. (2021). Causal representation of multi-loop Feynman integrands within the loop-tree duality. \textit{J. High Energy Phys.}, \textit{01}(1), 69--26pp.

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