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  1. Kristensen, J.: Expanding end-users' query statements for free text searching with a search-aid thesaurus (1993) 10.31 
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  2. Kristensen, J.; Järvelin, K.: ¬The effectiveness of a searching thesaurus in free-text searching in a full-text database (1990) 10.31 
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  3. Järvelin, K.; Kristensen, J.; Niemi, T.; Sormunen, E.; Keskustalo, H.: ¬A deductive data model for query expansion (1996) 10.31 
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