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Work supported in part by the United States Atomic Energy Commission.
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Feller, J., Litke, A., Madaras, R. et al. Muon pair production by electron-positron annihilation at 4 GeV center-of-mass energy. Lett. Nuovo Cimento 8, 1020–1024 (1973). https://doi.org/10.1007/BF02725718
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DOI: https://doi.org/10.1007/BF02725718