Gluon production on two centers and the effective action approach M.A. Braun, L.N. Lipatov, M.Yu. Salykin and M.I. Vyazovsky Eur. Phys. J. C, 71 5 (2011) 1639 Published online: 19 May 2011 DOI: 10.1140/epjc/s10052-011-1639-9