1. ATLAS Collaboration, JHEP 11, 62 (2017)
2. LHCb Collaboration, JHEP 11, 30 (2017)
3. L.V. Gribov, E.M. Levin, M.G. Ryskin, Phys. Rep. 100, 1 (1983)
4. E.M. Levin, M.G. Ryskin, YuM Shabelsky, A.G. Shuvaev, Sov. J. Nucl. Phys. 53, 657 (1991)
5. S. Catani, M. Ciafaloni, F. Hautmann, Nucl. Phys. B 366, 135 (1991)