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  1. Walker, S.; Hancock-Beaulieu, M.: OKAPI at city : an evaluation facility for interactive IR (1991) 8.65
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  2. Beaulieu, M.; Payne, A.; Do, T.; Jones, S.: ENQUIRE Okapi project (1996) 8.65
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  3. 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) 8.65
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