2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188513We show that a Green function solution can be given for a class of non-homogeneous nonlinear systems having relevance in quantum field theory. This in turn means that a quantum field theory in the strong coupling limit can be formulated and the spectrum obtained.5 pages, 3 figures. Corrected typos. Accepted for publication in Modern Physics Letters AHigh Energy Physics - TheoryHigh Energy Physics - LatticeHigh Energy Physics - PhenomenologyMathematical Physicstext