2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14553A new method of deriving the cosmological evolution of radio AGN is described which is based on the premise of unified models for quasars and radio galaxies.To appear in Proc XIX Moriond Astrophysics meeting "Building the Galaxies: from the Primordial Universe to the Present Day", 13-20 March 1999Astrophysicstext