On the nonperturbative charm effects in inclusive B→Xcℓν decays I.I. Bigi, N. Uraltsev and R. Zwicky Eur. Phys. J. C, 50 3 (2007) 539-556 Published online: 06 March 2007 DOI: 10.1140/epjc/s10052-007-0216-8