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D. Metzler, R. Jones, F. Peng, and R. Zhang, "Improving search relevance for implicitly temporal queries", Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval, pp. 700–701, 2009.
R. Zhang, Y. Chang, Z. Zheng, D. Metzler, and J. Nie, "Search result re-ranking by feedback control adjustment for time-sensitive query", Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics, Companion Volume: Short Papers, pp. 165–168, 2009.