Untangling Text Data Mining Marti A Hearst author 1999-06 text Proceedings of the 37th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics College Park, Maryland, USA conference publication hearst-1999-untangling 10.3115/1034678.1034679 https://aclanthology.org/P99-1001/ 1999-06 3 10