G. Aad, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, Z. Hubáček, M. Vlasák, K. Augsten, T. Horažďovský, J. Jakůbek et al.: Search for anomalous production of prompt like-sign muon pairs and constraints on physics beyond the standard model with the ATLAS detector. Physical Review D 85(3), 032004 (2012). doi:10.1103/PhysRevD.85.032004