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Celio, E.B., Capon, G., Carletti, A.M. et al. Observation of the reactions e+e- → π+π-γ, μ+μ-γ. A test of Weizsäcker-Williams approximation for virtual electrons. Lett. Nuovo Cimento 27, 283–288 (1980). https://doi.org/10.1007/BF02817304
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DOI: https://doi.org/10.1007/BF02817304