Superior and Efficient Fully Unsupervised Pattern-based Concept Acquisition Using an Unsupervised Parser Dmitry Davidov author Roi Reichart author Ari Rappoport author 2009-06 text Proceedings of the Thirteenth Conference on Computational Natural Language Learning (CoNLL-2009) Suzanne Stevenson editor Xavier Carreras editor Association for Computational Linguistics Boulder, Colorado conference publication davidov-etal-2009-superior https://aclanthology.org/W09-1108/ 2009-06 48 56