Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons. - Aad, G; Abbott, B; Abdallah, J; Abdelalim, A; Abdesselam, A; Abdinov, O; Abi, B; Abolins, M; AbouZeid, O; Abramowicz, H; Abreu, H; Acerbi, E; et al. (Physical Review Letters, 2012)