@inproceedings{lita-carbonell-2008-cluster,
    title = "Cluster-Based Query Expansion for Statistical Question Answering",
    author = "Lita, Lucian Vlad  and
      Carbonell, Jaime",
    booktitle = "Proceedings of the Third International Joint Conference on Natural Language Processing: Volume-{I}",
    year = "2008",
    url = "https://preview.aclanthology.org/fix-sig-urls/I08-1056/"
}