Arturo Montejo-Ráez Luis Alfonso Ureña López Ralf Steinberger Text Categorization using bibliographic records: beyond document content. 2005 35 Proces. del Leng. Natural http://journal.sepln.org/sepln/ojs/ojs/index.php/pln/article/view/2959/1453 db/journals/pdln/pdln35.html#RaezLS05