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Mitev, N.N.; Walker, S.: Information retrieval aids in an online public access catalogue : automatic intelligent search sequencing (1985) 1.00
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Walker, S.: Okapi : Evaluating and enhancing an experimental online catalog (1987) 1.00
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Walker, S.: Ease of use in online catalogues : a plea for the user (1986) 1.00
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Walker, S.: ¬The free language approach to online catalogues (1985) 1.00
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Walker, S.: Improving subject access painlessly : recent work on the Okapi online catalogue projects (1988) 1.00
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Robertson, S.E.; Walker, S.; Beaulieu, M.: Experimentation as a way of life : Okapi at TREC (2000) 1.00
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Walker, S.: ¬The Okapi online catalogue research projects (1989) 1.00
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Hancock-Beaulieu, M.; Walker, S.: ¬An evaluation of automatic query expansion in an online library catalogue (1992) 1.00
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Walker, S.: Subject access in online catalogues (1991) 1.00
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