2015-02-272015-02-2720122090-3154http://downloads.hindawi.com/journals/gri/2012/758384.pdfhttp://hdl.handle.net/11441/23044engAtribución-NoComercial-SinDerivadas 4.0 Españahttp://creativecommons.org/licenses/by-nc-nd/4.0info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://idus.us.es/xmlui/handle/11441/23044