Associated production of Z bosons and b-jets at the LHC in the combined + collinear QCD factorization approachS. P. Baranov, H. Jung, A. V. Lipatov and M. A. MalyshevEur. Phys. J. C, 77 11 (2017) 772DOI: https://doi.org/10.1140/epjc/s10052-017-5369-5