Inclusive photoproduction of D *±-mesons at next-to-leading order in the general-mass variable-flavor-number schemeB. A. Kniehl, G. Kramer, I. Schienbein and H. SpiesbergerEur. Phys. J. C, 62 2 (2009) 365-374DOI: https://doi.org/10.1140/epjc/s10052-009-1027-x