Programa SALTRA2015-09-092015-09-092015-09-0922153152http://hdl.handle.net/11056/11457application/pdfesAtribución-NoComercial-SinDerivadas 3.0 Costa Ricahttp://creativecommons.org/licenses/by-nc-nd/3.0/cr/http://purl.org/coar/resource_type/c_6501