
Tahani, V.: ¬A general conceptual framework for information retrieval systems (1972)
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Broughton, V.: Structural, linguistic and mathematical elements in indexing languages and search engines : implications for the use of index languages in electronic and nonLIS environments (2000)
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Dominich, S.; Kiezer, T.: ¬A measure theoretic approach to information retrieval (2007)
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Hood, W.W.; Wilson, C.S.: Solving problems in library and information science using Fuzzy set theory (2002)
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Yang, C.C.; Wang, F.L.: Hierarchical summarization of large documents (2008)
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