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Hutchins, W.J.: ¬The concept of 'aboutness' in subject indexing (1978)
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Andersen, J.; Christensen, F.S.: Wittgenstein and indexing theory (2001)
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Herrera-Viedma, E.; Cordón, O.; Herrera, J.C.; Luqe, M.: ¬An IRS based on multi-granular lnguistic information (2003)
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Liddy, E.D.; Paik, W.; McKenna, M.; Yu, E.S.: ¬A natural language text retrieval system with relevance feedback (1995)
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Lassalle, E.; Lassalle, E.: Semantic models in information retrieval (2012)
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