2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54329Open-string theories may be related to suitable models of oriented closed strings. The resulting construction of ``open descendants'' is illustrated in a few simple cases that exhibit some of its key features.Talk Presented at SUSY 95, Palaiseau, FRANCE, May 1995, 13 pages, LATEX, 7 uuencoded figures in separate fileHigh Energy Physics - Theorytext