2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39700Parameter-free and perturbatively stable leading order (LO) and next-to-leading order (NLO) parton densities for real and virtual photons are presented.Contribution to the proceedings of the "8th International Workshop on Deep-Inelastic Scattering" (DIS2000), April 2000, Liverpool, UK; LaTeX 3 pages,2 eps-figures, needs sprocl.styHigh Energy Physics - Phenomenologytext