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Mitev, N.N.; Walker, S.: Information retrieval aids in an online public access catalogue : automatic intelligent search sequencing (1985)
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Walker, S.: Okapi : Evaluating and enhancing an experimental online catalog (1987)
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Mitev, N.N.; Venner, G.M.; Walker, S.: Designing an online public access catalogue : OKAPI, a catalogue on a local area network (1985)
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