G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, K. Augsten, D. Caforio, P. Gallus, J. Guenther, J. Jakůbek et al.: Evidence of W gamma gamma Production in pp Collisions at root s=8 TeV and Limits on Anomalous Quartic Gauge Couplings with the ATLAS Detector. Physical Review Letters 115(3), 031802 (2015). doi:10.1103/PhysRevLett.115.031802