Trainer, J. Problemáticas Disruptivas a través Del Tiempo: Breve genealogía “Ad libitum” Sobre márgenes Que Manifestó La Escuela. (Argentina, 1970-2010) Disruptive Issues through Time: Brief “Ad libitum” Genealogy on the Margins Manifested by Schools (Argentina, 1. praxed 2018, 22, 112-132.