@article {Aad:2014laa,
	title = {{Observation of an Excited $B_c^\pm$ Meson State with the ATLAS Detector}},
	journal = {Phys. Rev. Lett.},
	volume = {113},
	number = {21},
	year = {2014},
	pages = {212004},
	doi = {10.1103/PhysRevLett.113.212004},
	author = {Aad, Georges and others}
}
