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Lahiri, A., Bagchi, B. & Gautam, V.P. On the isospin-violating decay ψ′ → ψπ0 and η-π0 mixing. Lett. Nuovo Cimento 29, 433–436 (1980). https://doi.org/10.1007/BF02743247
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DOI: https://doi.org/10.1007/BF02743247