G. Aad, B. Abbott, D. C. Abbott, A. Abud, B. Ali, K. Augsten, B. Bergmann, M. Havránek, Z. Hubáček, M. Myška et al.: Combination of searches for Higgs boson pairs in pp collisions at root s=13 TeV with the ATLAS detector. Physics Letters B 800, 135103 (2020). doi:10.1016/j.physletb.2019.135103