Passage-level evidence in document retrieval
SIGIR '94 Proceedings of the 17th annual international ACM SIGIR conference on Research and development in information retrieval
Stemming algorithms: a case study for detailed evaluation
Journal of the American Society for Information Science - Special issue: evaluation of information retrieval systems
Query expansion using local and global document analysis
SIGIR '96 Proceedings of the 19th annual international ACM SIGIR conference on Research and development in information retrieval
Viewing stemming as recall enhancement
SIGIR '96 Proceedings of the 19th annual international ACM SIGIR conference on Research and development in information retrieval
Effective ranking with arbitrary passages
Journal of the American Society for Information Science and Technology
Passage selection to improve Question Answering
MultiSumQA '02 proceedings of the 2002 conference on multilingual summarization and question answering - Volume 19
Building a reusable test collection for question answering
Journal of the American Society for Information Science and Technology - Research Articles
Passage retrieval for question answering using sliding windows
IRQA '08 Coling 2008: Proceedings of the 2nd workshop on Information Retrieval for Question Answering
Model tree learning for query term weighting in question answering
ECIR'07 Proceedings of the 29th European conference on IR research
Assessing the impact of thesaurus-based expansion techniques in QA-centric IR
CLEF'08 Proceedings of the 9th Cross-language evaluation forum conference on Evaluating systems for multilingual and multimodal information access
Compositional question answering: A divide and conquer approach
Information Processing and Management: an International Journal
A re-examination of IR techniques in QA system
IJCNLP'04 Proceedings of the First international joint conference on Natural Language Processing
Machine learning for query formulation in question answering
Natural Language Engineering
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Current question answering systems rely on document retrieval as a means of providing documents which are likely to contain an answer to a user's question. A question answering system heavily depends on the effectiveness of a retrieval system: If a retrieval system fails to find any relevant documents for a question, further processing steps to extract an answer will inevitably fail, too. In this paper, we compare the effectiveness of some common retrieval techniques with respect to their usefulness for question answering.