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Robertson, S.E.; Walker, S.; Beaulieu, M.M.; Gatford, M.; Payne, A.: Okapi at TREC-4 (1996) 0.03

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Imprint: Gaithersburgh, MD : National Institute of Standards and Technology

Beaulieu, M.M.; Gatford, M.; Huang, X.; Robertson, S.E.; Walker, S.; Williams, P.: Okapi an TREC-5 (1997) 0.03

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Imprint: Gaithersburgh, MD : National Institute of Standards and Technology

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