@article {1693,
	title = {Observation of Sequential Y Suppression in Pbpb Collisions},
	journal = {Physical Review Letters},
	year = {2012},
	note = {n/a},
	author = {S. Chatrchyan and Khachatryan, V. and A. Ellithi Kamel  (CMS Collaboration) and et al}
}
