Jaime Ramírez, Hélios2013-04-172013-04-1720031134-7627http://hdl.handle.net/10641/761spaAttribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ProgresoCiencia y civilización-s. XXIdeosemánticajournal articleopen access