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<p>Major research issues in information retrieval are reviewed, and developments in knowledge-based approaches are described. It is argued that although a fair amount of work has been done, the effectiveness of this approach has yet to be demonstrated. It is suggested that statistical techniques and knowledge-based approaches should be viewed as complementary, rather than competitive.</p>
W. Bruce Croft, "Knowledge-Based and Statistical Approaches to Text Retrieval", IEEE Intelligent Systems, vol. 8, no. , pp. 8-12, April 1993, doi:10.1109/64.207424
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