@article{OPUS4-12896,
  title     = {Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at √s=7 TeV with the ATLAS detector},
  journal   = {Journal of High Energy Physics},
  volume    = {04},
  number    = {69},
  doi       = {10.1007/JHEP04(2012)069},
  year      = {2012},
}