@congreso_internacional{553, author = {Carlos Porcel and Enrique Herrera-Viedma and M.J Lizarte}, title = {A linguistic recommender system for university digital libraries to help students in their learning processes}, year = {2009}, volume = {1}, pages = {3590-3600}, month = {July 6-8th}, publisher = {EDULEARN 09}, address = {Barcelona (Spain)}, }