Programa SALTRA2015-09-072015-09-072015-09-0722153152http://hdl.handle.net/11056/11453application/pdfesAtribución-NoComercial-SinDerivadas 3.0 Costa Ricahttp://creativecommons.org/licenses/by-nc-nd/3.0/cr/13http://purl.org/coar/resource_type/c_93fc