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Bell, Guido; Pilipp, Volker (2009). B−→π−π0/ρ−ρ0 to next-to-next-to-leading order in QCD factorization. Physical review. D - particles, fields, gravitation, and cosmology, 80(5), p. 54024. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.80.054024