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Bordogna, G.; Pasi, G.: ¬A fuzzy linguistic approach generalizing Boolean information retrieval : a model and its evaluation (1993)
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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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Kim, Y.W.; Kim, J.H.: ¬A model of knowledge based information retrieval with hierarchical concept graph (1990)
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Colace, F.; Santo, M. de; Greco, L.; Napoletano, P.: Improving relevance feedback-based query expansion by the use of a weighted word pairs approach (2015)
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Frei, H.P.; Meienberg, S.: Evaluating weighted search terms as Boolean queries (1991)
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