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Walker, S.: Ease of use in online catalogues : a plea for the user (1986)
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Walker, S.: ¬The free language approach to online catalogues (1985)
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Walker, S.: ¬Der Mensch-Maschine-Dialog bei Online-Benutzer-Katalogen (1987)
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Walker, R.: Categorization
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Walker, S.: Views on classification as a search tool on a computer (1991)
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Larson, R.R.: Evaluation of advanced retrieval techniques in an experimental online catalog (1992)
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Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The changing face of OKAPI (1994)
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Robertson, S.E.: OKAPI at TREC (1994)
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Robertson, S.E.: OKAPI at TREC-1 (1994)
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Karamuftuoglu, M.: Designing language games in Okapi (1997)
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