1. Blum, A., Mitchell, T.: Combining labeled and unlabeled data with co-training. In: Proceedings of COLT 1998, pp. 92–100 (1998)
2. Boyapati, V.: Improving hierarchical text classification using unlabeled data. In: Proceedings of SIGIR (2002)
3. Bollmann, P., Cherniavsky, V.: Measurement-theoretical investigation of the mz-metric. Information Retrieval Research, 256–267 (1981)
4. Cohen, W.: Automatically extracting features for concept learning from the Web. In: Proceedings of the ICML (2000)
5. Craven, M., DiPasquo, D., Freitag, D., MaCallum, A., Mitchell, T., Nigam, K., Slattery, S.: Learning to extract symbolic knowledge from the World Wide Web. In: Proceedings of AAAI 1998, pp. 509–516 (1998)