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Robertson, S.E.: OKAPI at TREC (1994)
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Robertson, S.E.: Overview of the Okapi projects (1997)
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Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996)
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Okapi and information retrieval (1997)
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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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