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Robertson, S.E.: OKAPI at TREC (1994)
8.65
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Robertson, S.E.: OKAPI at TREC-1 (1994)
8.65
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Robertson, S.E.; Walker, S.; Beaulieu, M.M.; Gatford, M.; Payne, A.: Okapi at TREC-4 (1996)
8.65
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Robertson, S.E.: OKAPI at TREC-3 (1995)
8.65
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