Serrera Contreras, Ramón María2015-09-102015-09-1020091137-2885http://hdl.handle.net/11441/28307application/pdfspaAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess