1. Snowball: Extracting relations from large plain-text collections;Agichtein,2000
2. Querying text databases for efficient information extraction;Agichtein,2003
3. Snowball: A prototype system for extracting relations from large text collections;Agichtein,2001
4. Combining labeled and unlabeled data with co-training;Blum,1998
5. Some advances in rule-based part of speech tagging;Brill,1994