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Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The changing face of OKAPI (1994)
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Beaulieu, M.; Payne, A.; Do, T.; Jones, S.: ENQUIRE Okapi project (1996)
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Jones, S.: Query modelling for IR interface design (1995)
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Hancock-Beaulieu, M.; Fieldhouse, M.; Do, T.: ¬A graphical interface for OKAPI : the design and evaluation of an online catalogue system with direct manipulation interaction for subject access (1994)
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Robertson, S.E.: OKAPI at TREC-3 (1995)
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