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MacLeod, I.A.: Text retrieval and the relational model (1991)
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Everett, D.M.; Cater, S.C.: Topology of document retrieval systems (1992)
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Tudhope, D.: Virtual architecture based on a binary relational model : a museum hypermedia application (1994)
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Green, R.: Development of a relational thesaurus (1996)
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Lee, J.H.; Kim, M.H.: Ranking documents in thesaurus-based Boolean retrieval systems (1994)
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