@article {Aad:2015uwa,
	title = {{Observation of top-quark pair production in association with a photon and measurement of the $t\bar{t}\gamma$ production cross section in pp collisions at $\sqrt{s}=7$ TeV using the ATLAS detector}},
	journal = {Phys. Rev. D},
	volume = {91},
	number = {7},
	year = {2015},
	pages = {072007},
	doi = {10.1103/PhysRevD.91.072007},
	author = {Aad, Georges and others}
}
