1. Abdul-Jaleel, N., Allan, J., Croft, W. B., Diaz, F., Larkey, L., Li, X. et al. (2004). UMASS at TREC 2004—novelty and hard. In Proceedings of the thirteenth text retrieval conference (TREC-13).
2. Allan, J. (2003). HARD track overview in TREC 2003: High accuracy retrieval from documents. In Proceedings of the twelfth text retrieval conference (TREC-12) (pp. 24–37).
3. Allan, J., Connell, M. E., Croft, W. B., Feng, F.-F., Fisher, D., & Li, X. (2000). INQUERY and TREC-9. In Proceedings of the ninth text retrieval conference (TREC-9) (pp. 551–562). nIST Special Publication 500-249.
4. Ashoori, E., Lalmas, M., & Tsikrika, T. (2007). Examining topic shifts in content-oriented XML retrieval. International Journal on Digital Libraries, 8(1), 39–60.
5. Barzilay, R., & Lee, L. (2004). Catching the drift: Probabilistic content models, with applications to generation and summarization. In HLT-NAACL 2004: Proceedings of the main conference (pp. 113–120).