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Robertson, S.E.; Walker, S.; Beaulieu, M.: Laboratory experiments with Okapi : participation in the TREC programme (1997)
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- Journal of documentation. 53(1997) no.1, S.20-34
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Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996)
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- Journal of the American Society for Information Science. 47(1996) no.1, S.85-94