@inproceedings {4149,
	title = {Passage Retrieval vs. Document Retrieval for Factoid Question Answering},
	booktitle = {International Conference on Research and Development in Information Retrieval (SIGIR)},
	year = {2003},
	doi = {10.1145/860435.860534},
	author = {Charles Clarke and Egidio L. Terra}
}
