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  1. Khoo, C.S.G.; Poo, D.C.C.: ¬An expert system approach to online catalog subject searching (1994) 10.05
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  2. Poo, D.C.C.; Khoo, C.: Subject searching in online catalog systems (1997) 10.05
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  3. Poo, D.C.C.; Khoo, C.S.G.: Online Catalog Subject Searching (2009) 10.05
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  4. Agarwal, N.K.; Xu, Y.(C.); Poo, D.C.C.: ¬A context-based investigation into source use by information seekers (2011) 10.05
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