Programa SALTRA2016-01-072016-01-072016-01-0722153152http://hdl.handle.net/11056/12014esAtribución-NoComercial-SinDerivadas 3.0 Costa Ricahttp://creativecommons.org/licenses/by-nc-nd/3.0/cr/http://purl.org/coar/resource_type/c_1843