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Walker, S.; DeVere, R.: Improving subject retrieval in online catalogues : T.2: Relevance feedback and query expansion (1990)
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Walker, S.; Hancock-Beaulieu, M.: OKAPI at city : an evaluation facility for interactive IR (1991)
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Walker, S.; Jones, R.M.: Improving subject retrieval in online catalogues : T.1: Stemming, automatic spelling correction and cross-reference tables (1987)
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