Unsupervised Information Extraction Approach Using Graph Mutual Reinforcement Hany Hassan author Ahmed Hassan author Ossama Emam author 2006-07 text Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing Dan Jurafsky editor Eric Gaussier editor Association for Computational Linguistics Sydney, Australia conference publication hassan-etal-2006-unsupervised https://aclanthology.org/W06-1659/ 2006-07 501 508