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\bibitem{Tani_etal2021} Tani, A., Ikeno, N., Jido, D., Nagahiro, H., Fujioka, H., Itahashi, K., et al. (2021). Structure of double pionic atoms. \textit{Prog. Theor. Exp. Phys.}, \textit{2021}(3), 033D02--16pp.

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