1. I.I. Bigi, N. Uraltsev and R. Zwicky, On the nonperturbative charm effects in inclusive B → X c lν decays, Eur. Phys. J. C 50 (2007) 539 [ hep-ph/0511158 ] [ SPIRES ].
2. C. Breidenbach, T. Feldmann, T. Mannel and S. Turczyk, On the role of ’Intrinsic Charm’ in semi-leptonic B-meson decays, Phys. Rev. D 78 (2008) 014022 [ arXiv:0805.0971 ] [ SPIRES ].
3. S.J. Brodsky and S. Gardner, Evading the CKM hierarchy: intrinsic charm in B decays, Phys. Rev. D 65 (2002) 054016 [ hep-ph/0108121 ] [ SPIRES ].
4. S.J. Brodsky, P. Hoyer, C. Peterson and N. Sakai, The intrinsic charm of the proton, Phys. Lett. B 93 (1980) 451 [ SPIRES ].
5. S.J. Brodsky, C. Peterson and N. Sakai, Intrinsic heavy quark states, Phys. Rev. D 23 (1981) 2745 [ SPIRES ].