@inproceedings{SIGIR-2003-YangCWK,
	author        = "Hui Yang and Tat-Seng Chua and Shuguang Wang and Chun-Keat Koh",
	booktitle     = "{Proceedings of the 26th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/860435.860444",
	isbn          = "1-58113-646-3",
	pages         = "33--40",
	publisher     = "{ACM}",
	title         = "{Structured use of external knowledge for event-based open domain question answering}",
	year          = 2003,
}