2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11816Some aspects of theory of gamma-ray production in blazar type active galaxies are discussed in the context of recent observations.16 pages, 1 figure, Latex, mem.sty, to appear in Proc. Frascati Workshop 1997, Mem. S.A.ItAstrophysicstext