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arxiv ref:
1410.8849
Title:
Parton distributions for the LHC Run II
Authors:
R. D. Ball, V. Bertone, S. Carrazza, C. S. Deans, L. Del Debbio, S. Forte, A. Guffanti, N. P. Hartland, J. I. Latorre, J. Rojo, M. Ubiali