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Supported in part by the National Science Foundation, Center for Theoretical Physics, under Grant No. NSF GU 2061.
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Sato, H. A new finite-energy sum rule in electron-positron annihilation. Lett. Nuovo Cimento 12, 43–48 (1975). https://doi.org/10.1007/BF02813728
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DOI: https://doi.org/10.1007/BF02813728