Chatrchyan, S., Khachatryan, V., Sirunyan, A.M., Gülmez, E., Işıldak, B., Kaya, M., Kaya, Ö., Özkürücüklü, S., Sönmez, N. et al., "Observation of Sequential upsilon Suppression in PbPb Collisions", Physical Review Letters, 109, 22 Article Number: 22230, 2012.