2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104520Starting from a genuinely nonperturbative formulation of photon-proton scattering we discuss which approximations and assumptions are required to obtain the dipole picture of high energy scattering.6 pages, talk presented by C. Ewerz at the XIth International Conference on Elastic and Diffractive Scattering, Blois, May 2005High Energy Physics - Phenomenologytext