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Robertson, S.E.: Overview of the Okapi projects (1997)
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Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The changing face of OKAPI (1994)
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Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996)
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Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The design of a graphical user interface for a highly interactive information retrieval system (1996)
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