Barrier Features for Classification of Semantic Relations Anita Alicante author Anna Corazza author 2011-09 text Proceedings of the International Conference Recent Advances in Natural Language Processing 2011 Ruslan Mitkov editor Galia Angelova editor Association for Computational Linguistics Hissar, Bulgaria conference publication alicante-corazza-2011-barrier https://aclanthology.org/R11-1070/ 2011-09 509 514