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Karamuftuoglu, M.: Designing language games in Okapi (1997)
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Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The changing face of OKAPI (1994)
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Keen, M.: ¬The Okapi projects (1997)
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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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Lu, W.; MacFarlane, A.; Venuti, F.: Okapi-based XML indexing (2009)
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