Yl. Dokshitzer et al., SPECIFIC FEATURES OF HEAVY-QUARK PRODUCTION - LOCAL PARTON-HADRON DUALITY APPROACH TO HEAVY-PARTICLE SPECTRA, Physical review. D. Particles and fields, 53(1), 1996, pp. 89-119
A perturbative QCD formula for inclusive energy spectra of heavy quark
s from heavy quark initiated jets, which takes into account collinear
and/or soft logarithms in all orders, the exact first order result, an
d two-loop effects is applied to distributions of heavy flavored hadro
ns in the framework of the local parton-hadron duality concept.