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 AA; Abdesselam A; Abdinov O; Abi B; Abolins M; AbouZeid OS; Abramowicz H; Abreu H; Acerbi E; et al. (Physical review letters, 2012)