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Zhai, Chengxiang and Lafferty, John (2004): A study of smoothing methods for language models applied to information retrieval. In ACM Transactions on Information Systems, 22 (2) pp. 179-214214
Zhai, Cheng Xiang, Cohen, William W. and Lafferty, John (2003): Beyond independent relevance: methods and evaluation metrics for subtopic retrieval. In: Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2003. pp. 10-17. Available online
Zhai, Chengxiang and Lafferty, John (2002): Two-stage language models for information retrieval. In: Proceedings of the 25th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2002. pp. 49-56. Available online
Lafferty, John and Zhai, Chengxiang (2001): Document language models, query models, and risk minimization for information retrieval. In: Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2001. pp. 111-119. Available online
Zhai, Chengxiang and Lafferty, John (2001): A study of smoothing methods for language models applied to Ad Hoc information retrieval. In: Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 2001. pp. 334-342. Available online
Berger, Adam and Lafferty, John (1999): Information Retrieval as Statistical Translation. In: Proceedings of the 22nd Annual International ACM SIGIR Conference on Research and Development in Information Retrieval 1999. pp. 222-229. Available online
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