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Ruiz-Casado, M.; Alfonseca, E. & Castells, P. (2005), Automatic Extraction of Semantic Relationships for WordNet by Means of Pattern Learning from Wikipedia, in Andrés Montoyo; Rafael Muñoz & Elisabeth Métais, ed., 'Natural Language Processing and Information Systems' , Springer, Berlin / Heidelberg , pp. 233-242 .