Valor Piechotta, Magdalena2015-06-292015-06-291999http://hdl.handle.net/11441/26186application/pdfspaAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/bookPartinfo:eu-repo/semantics/openAccess