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Qiu, Y.; Frei, H.P.: Concept based query expansion (1993)
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Hancock-Beaulieu, M.: Interactive query expansion in an OPAC : interface and retrieval issues (1995)
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Harman, D.: Automatic indexing (1994)
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Gauch, S.; Chong, M.K.: Automatic word similarity detection for TREC 4 query expansion (1996)
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