Unsupervised Knowledge Extraction for Taxonomies of Concepts from Wikipedia Eduard Barbu author Massimo Poesio author 2009-09 text Proceedings of the International Conference RANLP-2009 Galia Angelova editor Ruslan Mitkov editor Association for Computational Linguistics Borovets, Bulgaria conference publication barbu-poesio-2009-unsupervised https://aclanthology.org/R09-1006/ 2009-09 28 32