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Lee, J.H.; Kim, M.H.: Ranking documents in thesaurus-based Boolean retrieval systems (1994)
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Lee, J.H.; Kim, M.H.; Lee, Y.J.: Information retrieval based on conceptual distance in is-a hierarchies (1993)
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Everett, D.M.; Cater, S.C.: Topology of document retrieval systems (1992)
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Tammaro, A.M.: ¬La ricerca ed il recupero dell'informazione (1996)
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Cordón, O.; Herrera-Viedma, E.; Luque, M.; Moya Anegón, F. de; Zarco, C.: ¬An inductive query by example technique for extended Boolean queries based on simulated annealing-programming (2003)
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