2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15126Supermassive binary black holes and their influence on the structure and evolution of galaxies is reviewed.10 pages, 3 figures, uses paspconf.sty. To appear in "Galaxy Dynamics: From the Early Universe to the Present", eds. F. Combes, G. Mamon and V. CharmandarisAstrophysicstext