Theory of B→K (∗) l + l − decays at high q 2: OPE and quark–hadron duality M. Beylich, G. Buchalla and T. Feldmann Eur. Phys. J. C, 71 5 (2011) 1635 Published online: 10 May 2011 DOI: 10.1140/epjc/s10052-011-1635-0