G. Aad, T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, K. Augsten, T. Holý, Z. Hubáček, J. Jakůbek, Z. Kohout et al.: Measurement of charged-particle event shape variables in inclusive root(s)=7 TeV proton-proton interactions with the ATLAS detector. Physical Review D 88(3), 032004 (2013). doi:10.1103/PhysRevD.88.032004