2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49080We discuss specific observables that can be measured in deep inelastic leptoproduction in the case of 1-particle inclusive measurements, namely azimuthal asymmetries. These asymmetries contain information on the intrinsic transverse momentum of partons, with close connection to the gluon dynamics in hadrons.16 pages with figures, LaTex, uses sprocl.sty and epsfig.sty. Invited talk at the workshop on Physics with Electron Polarized Ion Collider (EPIC99), IUCF, Bloomington, April 8 - 11, 1999High Energy Physics - Phenomenologytext