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\bibitem{Fischer_etal2021} Fischer, M., Kostrzewa, B., Liu, L. M., Romero-Lopez, F., Ueding, M., \& Urbach, C. (2021). Scattering of two and three physical pions at maximal isospin from lattice QCD Extended Twisted Mass Collaboration. \textit{Eur. Phys. J. C}, \textit{81}(5), 436--19pp.

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