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Ferroglia, Andrea; Greub, Christoph; Sirlin, Alberto; Zhang, Zhibai (2013). Contributions of the W-boson propagator to the μ and τ leptonic decay rates. Physical review. D - particles, fields, gravitation, and cosmology, 88(3), 033012. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.88.033012