G. Aad, B. Abbott, J. Abdallah, O. Abdinov, K. Augsten, D. Caforio, P. Gallus, J. Guenther, Z. Hubáček, J. Jakůbek et al.: Probing lepton flavour violation via neutrinoless tau -> 3 mu decays with the ATLAS detector. The European Physical Journal C 76(5), 232 (2016). doi:10.1140/epjc/s10052-016-4041-9