Unifying approaches: derivation of Balitsky hierarchy from the Lipatov effective action S. Bondarenko, S. Pozdnyakov and A. Prygarin Eur. Phys. J. C, 81 9 (2021) 793 Published online: 07 September 2021 DOI: 10.1140/epjc/s10052-021-09572-0