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Alexandrou, C.; Bacchio, S.; Bergner, G.; Dimopoulos, P.; Finkenrath, J.; Frezzotti, R.; Garofalo, M.; Kostrzewa, B.; Koutsou, G.; Labus, P.; Sanfilippo, F.; Simula, S.; Ueding, M.; Urbach, C.; Wenger, Urs (2021). Ratio of kaon and pion leptonic decay constants with N f = 2 + 1 + 1 Wilson-clover twisted-mass fermions. Physical review. D - particles, fields, gravitation, and cosmology, 104(7), 074520. American Physical Society 10.1103/PhysRevD.104.074520