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Beaulieu, M.; Payne, A.; Do, T.; Jones, S.: ENQUIRE Okapi project (1996)
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Beaulieu, M.; Gatford, M.; Jones, S.: Widening access to Okapi (2000)
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Beaulieu, M.; Jones, S.: Interactive searching and interface issues in the Okapi best match probabilistic retrieval system (1998)
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