Learning with Unlabeled Data for Text Categorization Using a Bootstrapping and a Feature Projection Technique Youngjoong Ko author Jungyun Seo author 2004-07 text Proceedings of the 42nd Annual Meeting of the Association for Computational Linguistics (ACL-04) Barcelona, Spain conference publication ko-seo-2004-learning 10.3115/1218955.1218988 https://aclanthology.org/P04-1033/ 2004-07 255 262