Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production F. Caporale, F. G. Celiberto, G. Chachamis and A. Sabio Vera Eur. Phys. J. C, 76 3 (2016) 165 Published online: 25 March 2016 DOI: 10.1140/epjc/s10052-016-3963-6