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\bibitem{Ikeno_etal2011} Ikeno, N., Kimura, R., Yamagata-Sekihara, J., Nagahiro, H., Jido, D., Itahashi, K., et al. (2011). Precision Spectroscopy of Deeply Bound Pionic Atoms and Partial Restoration of Chiral Symmetry in Medium. \textit{Prog. Theor. Phys.}, \textit{126}(3), 483--509.

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