@article{OPUS4-17354,
  title     = {Measurements of top-quark pair to \(Z\)-boson cross-section ratios at \(\sqrt{s}\) \(=13 , 8, 7\) TeV with the ATLAS detector},
  journal   = {Journal of High Energy Physics},
  volume    = {2017},
  number    = {02},
  doi       = {10.1007/JHEP02(2017)117},
  year      = {2017},
}