2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49423The status of the resummation of small x contributions to the unpolarized and polarized deep inelastic structure functions is reviewed.15 pages LATEX including 6 eps-files; Lecture notes to appear in: 'New Trends in HERA Physics 1999', eds. G. Grindhammer, B. Kniehl, and G. Kramer (Springer, Berlin, 1999)High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext