2015-01-202015-01-20200584-9749-136-Xhttp://ruc.udc.es/dspace/bitstream/2183/11352/1/CC-78%20art%2018.pdfhttp://hdl.handle.net/11441/18008spahttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess