ATLAS Collaboration, Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;
ATLAS Collaboration (2018). Measurement of the production cross-section of a single top quark in association with a $Z$ boson in proton--proton collisions at 13 TeV with the ATLAS detector. Physics Letters B, (780), 557. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2017-221.