Vector-boson production at hadron colliders: hard-collinear coefficients at the NNLOStefano Catani, Leandro Cieri, Daniel Florian, Giancarlo Ferrera and Massimiliano GrazziniEur. Phys. J. C, 72 11 (2012) 2195DOI: https://doi.org/10.1140/epjc/s10052-012-2195-7