Yarce, Jorge2017-09-212017-09-2119920212-83652253-900Xhttp://hdl.handle.net/11441/64539application/pdfspaAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.12795/themata