Production of a gluon with the exchange of three reggeized gluons in the Lipatov effective action approachM.A. Braun, M.Yu. Salykin, S.S. Pozdnyakov and M.I. VyazovskyEur. Phys. J. C, 72 11 (2012) 2223DOI: https://doi.org/10.1140/epjc/s10052-012-2223-7