2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185126The small-x behavior of structure functions in the saturation region is determined by the non-linear generalization of the BFKL equation. I suggest the effective field theory for the small-x evolution which solves formally this equation. The result is the 2+1 functional integral for the structure functions at small x.5 pages, latex, 2 eps figuresHigh Energy Physics - Phenomenologytext