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Genz, H., Steiner, F. On\(\varepsilon {\mathcal{N}}{\mathcal{N}}\) and εππ couplingsand εππ couplings. Lett. Nuovo Cimento 1, 355–357 (1971). https://doi.org/10.1007/BF02815899
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DOI: https://doi.org/10.1007/BF02815899