G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, K. Augsten, D. Caforio, P. Gallus, J. Guenther, J. Jakůbek et al.: Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector. Physics Letters B 749, 519-541 (2015). doi:10.1016/j.physletb.2015.07.079