Theory of B→K (∗) l + l − decays at high q 2: OPE and quark–hadron dualityM. Beylich, G. Buchalla and T. FeldmannEur. Phys. J. C, 71 5 (2011) 1635DOI: https://doi.org/10.1140/epjc/s10052-011-1635-0