2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/195911We derive parametric travelling-wave solutions of non-linear QCD equations. They describe the evolution towards saturation in the geometric scaling region. The method, based on an expansion in the inverse of the wave velocity, leads to a solvable hierarchy of differential equations. A universal parametric form of travelling waves emerges from the first two orders of the expansion.4 pages, 1 figureHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext