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Beaulieu, M.M.; Gatford, M.; Huang, X.; Robertson, S.E.; Walker, S.; Williams, P.: Okapi an TREC-5 (1997)
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Robertson, S.E.: OKAPI at TREC (1994)
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Robertson, S.E.: OKAPI at TREC-1 (1994)
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Robertson, S.E.: OKAPI at TREC-3 (1995)
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