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2. Aslam, J. A., Ekstrand-Abueg, M., Pavlu, V., Diaz, F., & Sakai, T. (2013). Trec 2013 temporal summarization. In TREC.
3. Longformer: The long-document transformer;Beltagy,2020
4. Latent dirichlet allocation;Blei;Journal of Machine Learning Research,2003
5. Normalized (pointwise) mutual information in collocation extraction;Bouma,2009