2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46689An introduction to some outstanding issues in QCD is presented, with emphasis on work by Diakonov and co-workers on the influence of the instanton vacuum on low-energy QCD observables. This includes the calculation of input valence-parton distributions for deep-inelastic scattering.Latex, 24 pagesHigh Energy Physics - Phenomenologytext